gh-108724: Add PyMutex and _PyParkingLot APIs (gh-109344)

PyMutex is a one byte lock with fast, inlineable lock and unlock functions for the common uncontended case.  The design is based on WebKit's WTF::Lock.

PyMutex is built using the _PyParkingLot APIs, which provides a cross-platform futex-like API (based on WebKit's WTF::ParkingLot).  This internal API will be used for building other synchronization primitives used to implement PEP 703, such as one-time initialization and events.

This also includes tests and a mini benchmark in Tools/lockbench/lockbench.py to compare with the existing PyThread_type_lock.

Uncontended acquisition + release:
* Linux (x86-64): PyMutex: 11 ns, PyThread_type_lock: 44 ns
* macOS (arm64): PyMutex: 13 ns, PyThread_type_lock: 18 ns
* Windows (x86-64): PyMutex: 13 ns, PyThread_type_lock: 38 ns

PR Overview:

The primary purpose of this PR is to implement PyMutex, but there are a number of support pieces (described below).

* PyMutex:  A 1-byte lock that doesn't require memory allocation to initialize and is generally faster than the existing PyThread_type_lock.  The API is internal only for now.
* _PyParking_Lot:  A futex-like API based on the API of the same name in WebKit.  Used to implement PyMutex.
* _PyRawMutex:  A word sized lock used to implement _PyParking_Lot.
* PyEvent:  A one time event.  This was used a bunch in the "nogil" fork and is useful for testing the PyMutex implementation, so I've included it as part of the PR.
* pycore_llist.h:  Defines common operations on doubly-linked list.  Not strictly necessary (could do the list operations manually), but they come up frequently in the "nogil" fork. ( Similar to https://man.freebsd.org/cgi/man.cgi?queue)

---------

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>

PCbuild/_testinternalcapi.vcxproj

@@ -95,6 +95,7 @@
   <ItemGroup>
     <ClCompile Include="..\Modules\_testinternalcapi.c" />
     <ClCompile Include="..\Modules\_testinternalcapi\pytime.c" />
+    <ClCompile Include="..\Modules\_testinternalcapi\test_lock.c" />
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PCbuild/_testinternalcapi.vcxproj.filters

@@ -15,6 +15,9 @@
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+    <ClCompile Include="..\Modules\_testinternalcapi\test_lock.c">
+      <Filter>Source Files</Filter>
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PCbuild/pythoncore.vcxproj

@@ -245,6 +245,8 @@
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     <ClInclude Include="..\Include\internal\pycore_intrinsics.h" />
     <ClInclude Include="..\Include\internal\pycore_list.h" />
+    <ClInclude Include="..\Include\internal\pycore_llist.h" />
+    <ClInclude Include="..\Include\internal\pycore_lock.h" />
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     <ClInclude Include="..\Include\patchlevel.h" />
     <ClInclude Include="..\Include\py_curses.h" />
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     <ClCompile Include="..\Python\mystrtoul.c" />
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     <ClCompile Include="..\Python\optimizer_analysis.c" />
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PCbuild/pythoncore.vcxproj.filters

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       <Filter>Include</Filter>
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@@ -645,6 +648,12 @@
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@@ -717,6 +729,9 @@
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