[compiler-rt][asan] Add wcscpy/wcsncpy; enable wcscat/wcsncat on Windows (#160493)

Summary
- Add ASan interceptors for wcscpy/wcsncpy on all platforms.
- Enable wcscat/wcsncat on Windows (already enabled on POSIX via
sanitizer_common).

Motivation
- Use of wchar string APIs is common on Windows; improve parity with
char* string checks.

Changes
- Implement wcscpy/wcsncpy in asan_interceptors.cpp; check overlap and
mark read/write ranges in bytes.
- wcsncpy: compute write size in bytes (size * sizeof(wchar_t)) to avoid
missed overflows when sizeof(wchar_t) != 1.
- Use MaybeRealWcsnlen when available to bound reads.
- Register Windows static thunk for wcscpy/wcsncpy/wcscat/wcsncat; rely
on sanitizer_common interceptors for wcscat/wcsncat.
- Tests: add wcscpy/wcsncpy/wcscat/wcsncat; flush stdout before crash;
use resilient FileCheck patterns (reuse [[ADDR]], wildcard for function
suffixes and paths, flexible line numbers).

Testing
- AArch64 Linux: new tests pass with check-asan locally.

Follow-up to and based on prior work in PR #90909 (author: branh,
Microsoft); builds on that work and addresses review feedback. Thanks!

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Signed-off-by: Yixuan Cao <caoyixuan2019@email.szu.edu.cn>

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