ci: publish npm workflow

[fadeev]

A workflow to publish IDL files on npm. Published when a GitHub release is made.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 9.17%. Comparing base (3bc8dad) to head (bed715c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #21 +/- ## ===================================== Coverage 9.17% 9.17% ===================================== Files 1 1 Lines 218 218 ===================================== Hits 20 20 Misses 198 198 ```

:umbrella: View full report in Codecov by Sentry.
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[fadeev]

@zeta-chain/devops can someone, please, create a new npm package:

https://www.npmjs.com/package/@zetachain/protocol-contracts-solana

And add an npm token to this repo. Thanks!

[brewmaster012]

Whats the versioning of the published package?

[fadeev]

Whats the versioning of the published package?

To publish an npm package we'll be creating a GH release. Version specified in the release will be set as the version of the npm package.