add ability to configure code actions that trigger sign/virtual text

[trevorwhitney]

This PR adds a configuration option to the lsp.code_action section of the config to specify which code actions to exclude for triggering the sign and virtual text for.

The problem this solves is that, at least with gopls, there is a source.documentation code action that shows up for pretty much every line. This makes the sign and virtual text useless and noisy. The codeActions LSP call accepts an only parameter, setting this to a subset of the actions allows me to filter out the source.documenation action. The default is an empty table which will preserve the existing behavior.

I'm not sure if we want this exposed per language server, not sure how to plumb that in if so?

Here's some additional context on the problem this is solving: golang/go#68783

[trevorwhitney]

I might need some help with these tests, not sure I understand the failure

[ray-x]

Thanks, the github actions should be green once you merge the latest master