Destination - route records to topic based on metadata

[lovromazgon]

Description

Adds the ability to specify a Go template in the destination parameter topic. The default of this parameter was changed to {{ index .Metadata "opencdc.collection" }}, which means that records will be routed to the topic based on the collection they come from by default. The user can still specify a static topic.

Additionally, the code in this PR makes producing of records a bit safer, by ensuring that encountering an error when preparing the record won't disregard already produced records. It also sneaks in some housekeeping that makes sure we validate generated files are up to date and that golangci-lint can be updated using dependabot.

Fixes ConduitIO/conduit#1477

Quick checks:

• I have followed the Code Guidelines.
• There is no other pull request for the same update/change.
• I have written unit tests.
• I have made sure that the PR is of reasonable size and can be easily reviewed.

[maha-hajja]

lgtm

[raulb]

@lovromazgon code looks great. Just a a couple of questions before approving.