Format function argument separator comments (#5211)

## Summary

This is a complete rewrite of the handling of `/` and `*` comment
handling in function signatures. The key problem is that slash and star
don't have a note. We now parse out the positions of slash and star and
their respective preceding and following note. I've left code comments
for each possible case of function signature structure and comment
placement

## Test Plan

I extended the function statement fixtures with cases that i found. If
you have more weird edge cases your input would be appreciated.

crates/ruff_python_formatter/src/snapshots/ruff_python_formatter__tests__ruff_test__statement__function_py.snap

@@ -103,6 +103,140 @@ def foo(
     b=3 + 2  # comment
 ):
     ...
+
+
+# Comments on the slash or the star, both of which don't have a node
+def f11(
+    a,
+    # positional only comment, leading
+    /, # positional only comment, trailing
+    b,
+):
+    pass
+
+def f12(
+    a=1,
+    # positional only comment, leading
+    /, # positional only comment, trailing
+    b=2,
+):
+    pass
+
+def f13(
+    a,
+    # positional only comment, leading
+    /, # positional only comment, trailing
+):
+    pass
+
+def f21(
+    a=1,
+    # keyword only comment, leading
+    *, # keyword only comment, trailing
+    b=2,
+):
+    pass
+
+def f22(
+    a,
+    # keyword only comment, leading
+    *, # keyword only comment, trailing
+    b,
+):
+    pass
+
+def f23(
+    a,
+    # keyword only comment, leading
+    *args, # keyword only comment, trailing
+    b,
+):
+    pass
+
+def f24(
+    # keyword only comment, leading
+    *, # keyword only comment, trailing
+    a
+):
+    pass
+
+
+def f31(
+    a=1,
+    # positional only comment, leading
+    /, # positional only comment, trailing
+    b=2,
+    # keyword only comment, leading
+    *, # keyword only comment, trailing
+    c=3,
+):
+    pass
+
+def f32(
+    a,
+    # positional only comment, leading
+    /, # positional only comment, trailing
+    b,
+    # keyword only comment, leading
+    *, # keyword only comment, trailing
+    c,
+):
+    pass
+
+def f33(
+    a,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+    # keyword only comment, leading
+    *args, # keyword only comment, trailing
+    c,
+):
+    pass
+
+
+def f34(
+    a,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+    # keyword only comment, leading
+    *, # keyword only comment, trailing
+    c,
+):
+    pass
+
+def f35(
+    # keyword only comment, leading
+    *, # keyword only comment, trailing
+    c,
+):
+    pass
+
+# Multiple trailing comments
+def f41(
+    a,
+    / # 1
+    , # 2
+    # 3
+    * # 4
+    , # 5
+    c,
+):
+    pass
+
+# Multiple trailing comments strangely places. The goal here is only stable formatting,
+# the comments are placed to strangely to keep their relative position intact
+def f42(
+    a,
+    / # 1
+    # 2
+    , # 3
+    # 4
+    * # 5
+    # 6
+    , # 7
+    c,
+):
+    pass
 ```
 
 
@@ -237,6 +371,148 @@ def foo(
     b=3 + 2,  # comment
 ):
     ...
+
+
+# Comments on the slash or the star, both of which don't have a node
+def f11(
+    a,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+    b,
+):
+    pass
+
+
+def f12(
+    a=1,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+    b=2,
+):
+    pass
+
+
+def f13(
+    a,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+):
+    pass
+
+
+def f21(
+    a=1,
+    # keyword only comment, leading
+    *,  # keyword only comment, trailing
+    b=2,
+):
+    pass
+
+
+def f22(
+    a,
+    # keyword only comment, leading
+    *,  # keyword only comment, trailing
+    b,
+):
+    pass
+
+
+def f23(
+    a,
+    # keyword only comment, leading
+    *args,  # keyword only comment, trailing
+    b,
+):
+    pass
+
+
+def f24(
+    # keyword only comment, leading
+    *,  # keyword only comment, trailing
+    a,
+):
+    pass
+
+
+def f31(
+    a=1,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+    b=2,
+    # keyword only comment, leading
+    *,  # keyword only comment, trailing
+    c=3,
+):
+    pass
+
+
+def f32(
+    a,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+    b,
+    # keyword only comment, leading
+    *,  # keyword only comment, trailing
+    c,
+):
+    pass
+
+
+def f33(
+    a,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+    # keyword only comment, leading
+    *args,  # keyword only comment, trailing
+    c,
+):
+    pass
+
+
+def f34(
+    a,
+    # positional only comment, leading
+    /,  # positional only comment, trailing
+    # keyword only comment, leading
+    *,  # keyword only comment, trailing
+    c,
+):
+    pass
+
+
+def f35(
+    # keyword only comment, leading
+    *,  # keyword only comment, trailing
+    c,
+):
+    pass
+
+
+# Multiple trailing comments
+def f41(
+    a,
+    /,  # 1  # 2
+    # 3
+    *,  # 4  # 5
+    c,
+):
+    pass
+
+
+# Multiple trailing comments strangely places. The goal here is only stable formatting,
+# the comments are placed to strangely to keep their relative position intact
+def f42(
+    a,
+    /,  # 1
+    # 2
+    # 3
+    # 4
+    *,  # 5  # 7
+    # 6
+    c,
+):
+    pass
 ```