Format DictComp expression (#5771)

## Summary

Format `DictComp` like `ListComp` from #5600. It's not 100%, but I
figured maybe it's worth starting to explore.

## Test Plan

Added ruff fixture based on `ListComp`'s.

crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/dict_comp.py

@@ -0,0 +1,45 @@
+{i: i for i in []}
+
+{i: i for i in [1,]}
+
+{
+    a: a  # a
+    for # for
+    c  # c
+    in  # in
+    e  # e
+}
+
+{
+    # above a
+    a: a  # a
+    # above for
+    for # for
+    # above c
+    c  # c
+    # above in
+    in  # in
+    # above e
+    e  # e
+    # above if
+    if  # if
+    # above f
+    f  # f
+    # above if2
+    if  # if2
+    # above g
+    g  # g
+}
+
+{
+    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa + bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb + [dddddddddddddddddd, eeeeeeeeeeeeeeeeeee]: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+    for
+    ccccccccccccccccccccccccccccccccccccccc,
+    ddddddddddddddddddd, [eeeeeeeeeeeeeeeeeeeeee, fffffffffffffffffffffffff]
+    in
+    eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeffffffffffffffffffffffffggggggggggggggggggggghhhhhhhhhhhhhhothermoreeand_even_moreddddddddddddddddddddd
+    if
+    fffffffffffffffffffffffffffffffffffffffffff < gggggggggggggggggggggggggggggggggggggggggggggg < hhhhhhhhhhhhhhhhhhhhhhhhhh
+    if
+    gggggggggggggggggggggggggggggggggggggggggggg
+}