Add GraphQL type-checking errors

[Chnapy]

Custom compiler now shows graphql errors as typing errors.

Add graphql errors as TS error diagnostics.
Handle VS Code env managing logs.

Clean up tsc-ls/ code.
This part will be replaced by tsc-ls package, more generic, allowing to compile any code with its language service plugins (ts-gql-plugin, typescript-plugin-css-modules, etc...).

TODO later:

• use tsc-ls, remove tsc-ls/ folder
• update doc with tsc-ls recommandation for CLI uses