Common: Rewrite check_stuck_rules

[voetberg]

• Change gauge to PrometheusPusher
• update to sqla2.0
• sort imports
• update header
• change except to except Exception

Updated queries compile as (using the dev tables as an example)

SELECT count(*) AS count_1 
FROM dev.rules 
WHERE dev.rules.state = :state_1 AND (dev.rules.error != :error_1 OR dev.rules.error IS NULL)

SELECT count(*) AS count_1 
FROM dev.rules 
WHERE dev.rules.state = :state_1 AND dev.rules.error = :error_1

[voetberg]

Closing in favor of #162