[WIP][reference] Integrate graphql-js experimental parser

[thenamankumar]

This PR is in progress and contains the work done under GSOC2020

It integrates the experimental online parser from graphql-js in place of the graphiql parser. https://github.com/graphql/graphql-js/pull/2770

[x] Integrate with graphql mode in codemirror and support syntax highlighting [ ] Update auto suggestion utils

[acao]

awesome! needs to be added to the LSP (gls-interface) as well, for LSP server and codemirror/monaco-graphql

[saihaj]

During migration we decided to drop it. Need to re-write in TS with more tests see https://github.com/graphql/graphql-js/pull/3031