ts server plugin

[psteinroe]

a tsserver plugin should allow us to add sql language features to template literals within a typescript / javascript file.

[psteinroe]

after some research, I believe this must be solved on the editor side and not within tsserver.

For vscode, this should be possible via Request Forwarding. For Neovim, otter.nvim seems to be a good fit. we should try to make this as simple as possible.

But, since we are planning #177 anyways, we might as well look into the feasibility of running both tsserver and ours at the same time. Initial research suggests that this is not easily possible though.

[ThomAub]

would this work for other language like in a python script ?

[reteps]

Even if support was added for evaluating sql expressions within other languages, this extension would have a hard time expanding template literals without erroring. I created #396 to track support for templated expressions, which in my understanding is a prerequisite feature for supporting this.