[jni] Swap CRITICAL_SECTION with SRWLOCK

[HosseinYousefi]

Swap CRITICAL_SECTION with SRWLOCK on Windows as it doesn't require init/deinit in DllMain anymore.

Close #2698.

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PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
jni	Breaking	0.14.2	0.15.0-wip	0.15.0	✔️

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// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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[mraleph]

These two files really need cleanup they are very messy and don't follow Google C++ Style Guide. Ignore this for now though.

(e.g. why is it static inline in the header? Should be just inline. The name should be InitLock. It should be in the namespace. dartjni.c should be dartjni.cc, etc).

[HosseinYousefi]

Opened #2701