Add GetTaskMetrics and GetTaskLogs to agent

[pingsutw]

Tracking issue

NA

Why are the changes needed?

Allow agent to fetch the log and metrics from the external service, such as databricks and bigquery.

What changes were proposed in this pull request?

Add GetMetric and GetLog interface to the baseAgent

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• [ ] I updated the documentation accordingly.
• [ ] All new and existing tests passed.
• [ ] All commits are signed-off.

Related PRs

Docs link

[eapolinario]

@pingsutw , is this PR still valid?