feat(node_api): Add missing functions

[abhisekp]

Need proper testing

These are created using Cursor IDE using gpt4o using the following link as reference https://nodejs.org/docs/latest/api/n-api.html

[abhisekp]

@akshayganeshen Please review. Wherever required you can make the changes or ask me to make them.
And then we can finalize for this to merge.

I'm very new to these things. I learnt about this yesterday and released a package using this library to demonstrate various use cases https://www.npmjs.com/package/@abhisekp/go-native

[abhisekp]

Meanwhile, I have the new code ready for install https://github.com/abhisekp/napi-go

go get github.com/abhisekp/napi-go

[akshayganeshen]

Hey @abhisekp, this is really great! Thank you so much for putting this together!

I'll need a few weeks to test it, the plan is to just put together enough docs/examples/ to cover everything new. I'll also want to tweak the CONTRIBUTING.md guidelines a bit since I never really fleshed that out, but that's a pretty minor piece.

Will let you know if there's any changes I want to request, but for now this seems pretty solid.