feat: add openharmony support

[richerfu]

• Tested on all platforms changed
• Added an entry to CHANGELOG.md if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• Created or updated an example program if it would help users understand this functionality

Add openharmony platform support, now we can build it successfully with XComponent. It doesn't effect any other code, so i think i needn't to add more docs or tests.

And you can find a full example with example. If you want more info, please let me know, thanks !

[kchibisov]

You should also explicitly set that we depend on raw-window-handle 0.6.2, since the build will break otherwise.

[richerfu]

raw-window-handle

Should i update the raw-window-handle version to 0.6.2? Looks not..

[kchibisov]

Should i update the raw-window-handle version to 0.6.2? Looks not..

open harmony was added in 0.6.2, so you should explicitly specify 0.6.2

[richerfu]

Should i update the raw-window-handle version to 0.6.2? Looks not..

open harmony was added in 0.6.2, so you should explicitly specify 0.6.2

Done