std.windows: use atomic rename, if possible

[matu3ba]

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Mitigates #14978.

[matu3ba]

As far as I understand, there are no tests currently. If wanted, I can add some to show that the posix behavior is what it claims.

[andrewrk]

Closing abandoned pull request. Please open a new one if you wish to continue this work.

[matu3ba]

Found it in mingw64 upstream via rg '.*FILE_RENAME.*': mingw-w64-headers/include/winbase.h:3122

#if _WIN32_WINNT >= _WIN32_WINNT_WIN10_RS1
#define FILE_RENAME_FLAG_REPLACE_IF_EXISTS 0x00000001
#define FILE_RENAME_FLAG_POSIX_SEMANTICS 0x00000002
#endif

#if _WIN32_WINNT >= _WIN32_WINNT_WIN10_RS3
#define FILE_RENAME_FLAG_SUPPRESS_PIN_STATE_INHERITANCE 0x00000004
#endif

  typedef struct _FILE_RENAME_INFO {
#if _WIN32_WINNT >= _WIN32_WINNT_WIN10_RS1
    __C89_NAMELESS union {
        BOOLEAN ReplaceIfExists;
        DWORD Flags;
    };
#else
    BOOLEAN ReplaceIfExists;
#endif
    HANDLE RootDirectory;
    DWORD FileNameLength;
    WCHAR FileName[1];
  } FILE_RENAME_INFO,*PFILE_RENAME_INFO;

I'll probably make a PR next weekend unless somebody else is faster.