feat: support openharmony platform

[richerfu]

Issues:

Description of changes:

When using cmake for building, make sure to include the cmake files and parameters that openharmony needs to ensure a successful build.

Call-outs:

Point out areas that need special attention or support during the review process. Discuss architecture or design changes.

Testing:

How is this change tested (unit tests, fuzz tests, etc.)? Are there any testing steps to be verified by the reviewer?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[justsmth]

Are there any tools (similar to cross-rs or cargo-xwin) that would allow us to test compilation to an OpenHarmony target in our CI?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.67%. Comparing base (c358484) to head (45247cb).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #434      +/-   ##
==========================================
- Coverage   95.80%   92.67%   -3.13%     
==========================================
  Files          61       61              
  Lines        8143     8174      +31     
  Branches        0     8174    +8174     
==========================================
- Hits         7801     7575     -226     
- Misses        342      357      +15     
- Partials        0      242     +242     

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[richerfu]

Are there any tools (similar to cross-rs or cargo-xwin) that would allow us to test compilation to an OpenHarmony target in our CI?

No, in fact, there is currently no very suitable way to run code whose target architecture is openharmony, even rust or openharmony officially does not have it yet. When there is a suitable way, I will try to add the corresponding CI to support