Implementation of V1 buffer runtime functions

[paradowstack]

This PR brings in an implementation of following V1 buffer runtime functions:

• napi_create_buffer
• napi_create_buffer_copy
• napi_is_buffer
• napi_get_buffer_info
• napi_create_external_buffer

It also introduces test addon, adopted from https://github.com/nodejs/node/tree/main/test/node-api/test_buffer, that is placed in packages/node-addon-examples/tests/buffers.

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[kraenhansen]

I don't expect this to be defined when running in React Native.

[paradowstack]

From what I can see Hermes C++ API does not provide a way to trigger a garbage collection. I think without patching the Hermes it won't be possible to run this part of test when running in React Native - please correct me if I am wrong. In this case I will remove it for now.

[kraenhansen]

It's a good point and perhaps something we need to ask @vmoroz or @tmikov.

[kraenhansen]

Turns out I was wrong 🎉 globalThis.gc() should be available 🦾

[kraenhansen]

@paradowstack when you're ready to run the tests on Android and iOS you can add the two labels to the PR (not yet well documented). I just did this now, hope that's okay with you 🙏

[kraenhansen]

I think it's okay to merge once the Android and iOS tests has passed and look forward to improving the tests with #147.