Add Loki logs forwarding

[kimwnasptd]

Context

The Charm is missing forwarding logs to Loki. This is something that we do in other charms, i.e.
https://github.com/canonical/kfp-operators/blob/714541bd159e6e2fe0dce95b37652933419b646a/charms/kfp-schedwf/src/charm.py#L83

What needs to get done

1. Import the Loki library
2. Setup the self._logging property

Definition of Done

1. The charm's pebble logs are forwarded to Loki

[syncronize-issues-to-jira]

Thank you for reporting your feedback to us!

The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6792.

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