just needs tests

These are some custom functions with trivial defaults to extend the API. The main part that we care about is already tested in
https://github.com/atom-community/atom-languageclient/blob/code-actions-rust/test/adapters/code-action-adapter.test.ts

One test that checks that those functions are called and returning false prevents applying should be good.

🎉 This PR is included in version 1.14.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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