reject queries that are not string

[exterm]

If you pass an ActiveRecord::Relation, it will be executed when the call is analyzed for logging purposes, potentially timing out the migration.

Fix https://github.com/timescale/timescaledb-ruby/issues/115

I'm not quite sure why github id displaying my commit as unverified, it should be signed as usual.

[CLAassistant]

All committers have signed the CLA.

[exterm]

Note: I haven't been able to execute the tests locally; there doesn't seem to be documentation on how to do that. I assume I need to configure a database somehow?