feat(ui): table autocomplete in sql editor

[insmac]

Summary

This PR adds a table name completion to the SQL editor.

Changelog

• Using the existing Redux store, added table schema listing to it so it's accessible via selector app-wide.
• Split questdb-sql language definition file into logical chunks to avoid cluttering.
• Added two separate completion providers:
  1. questDBCompletionProvider that handles static QuestDB SQL grammar (as before)
  2. schemaCompletionProvider that provides table name completion. This one is disposed every time table schema is updated (i.e. DDL query, click on a refresh button etc) and has a limited set of trigger characters provided.

Features

• Detect typical table-related syntax
• Detect QuestDB's SELECT shorthand syntax
• Update the completion provider once a DDL query is performed or if user refreshes the table schema

Screen recording:

CleanShot.2021-12-29.at.14.56.04.mp4