Support SQL auto-complete and error highlighting in Snuba admin

[onkar]

Environment

Snuba admin

Steps to Reproduce

Today Snuba admin does not provide auto complete of SQL queries. While there are readymade query templates, autocomplete will be desirable. Additionally, highlighting errors will be useful to spot the problems easily.

Expected Result

SQL editor in Snuba admin provides autocomplete and errors are highlighted.

Actual Result

No SQL autocomplete exists and errors are not highlighted.