fix: repair CLI, handle all schema and LSP errors

[acao]

This should do what @divyenduz set out to do in #1481 more universally. Any exception in any of the handlers bubbles up to the GLS output channel now.

It also repairs the CLI. It was targeting esnext by default, thus a use of nullish coalescing was breaking the CLI (not supported natively in node yet).

So, I set it to target: es2017 for node 10 support.

Additionally, CLI should default method to node as advertised.

Tested with both the CLI using validate command, and vscode-graphql - the only issue there is the custom prisma extension is throwing an error. the extension works great if you remove that extension. I think it just needs to be upgraded for the new graphql-config?

[acao]

@divyenduz should probably add a few tests as well?

[acao]

@huv1k I saw you were interested in the first PR, do you want to give this one a test run?

This should solve the problem for all handlers and other errors (hover, completion, diagnostics, etc). I added this to a PR a while back where we were trying to add more error handling, because apparently there wasn't much before, but there weren't enough people to review the PR at the time so I removed it to make it simpler.

To help me out, could someone open a PR to add tests to this? If not I can work on it some more tomorrow. Have a lot of GraphiQL and Monaco things going on, making lots of changes to the LSP!

[acao]

have a few more improvements! dang the LSP server has some issues :(

[acao]

@divyenduz this takes care of a few things now!