[RULE REQUEST] enforce SQL queries to use template strings

[dwelle]

Add a rule require-template-queries, which would enforce use of template strings for queries.

These would be considered problems:

"SELECT text FROM article WHERE id = " + id
// Message: Use template strings for SQL queries

"SELECT text FROM article WHERE id = 3"
// Message: Use template strings for SQL queries

[gajus]

@dwelle are you available to submit a PR?

[dwelle]

@gajus sure thing. I'll get on it when time allows, soon.