Proposal: support for additional clauses

[mihar-22]

Support for the following clauses would make this library closer to feature complete in my opinion:

insert

api: query.insert('tableName')

output: INSERT INTO tableName

column

api: query.column('columnOne').column('columnTwo')

output: (columnOne, columnTwo)

value

api: query.value('valueOne').value('valueTwo')

output: VALUES (valueOne, valueTwo)

insert + column + value

api: query.insert('tableName').column('columnOne').column('columnTwo').value('valueOne').value('valueTwo')

output: INSERT INTO tableName (columnOne, columnTwo) VALUES (valueOne, valueTwo)

delete

api: query.delete('tableName')

output: DELETE FROM tableName

[terkelg]

I agree this could be nice. I haven't worked with Postgres in a while or had the need for this feature yet. I'm open to any PR that would implement this, but I won't have time to implement this myself