support for federated cluster scope datasource, such as one prometheu…

[kitianFresh]

…s to monitor multiple clusters

What type of PR is this?

Feature

What this PR does / why we need it:

support for multi clusters monitoring data source

Which issue(s) this PR fixes:

Fixes #401

Special notes for your reviewer:

[github-actions[bot]]

🎉 Successfully Build Images.

Overview: https://finops.coding.net/public-artifacts/gocrane/crane/packages

Image	Pull Command
crane-agent:pr-402-06ed2ab	docker pull finops-docker.pkg.coding.net/gocrane/crane/crane-agent:pr-402-06ed2ab
dashboard:pr-402-06ed2ab	docker pull finops-docker.pkg.coding.net/gocrane/crane/dashboard:pr-402-06ed2ab
metric-adapter:pr-402-06ed2ab	docker pull finops-docker.pkg.coding.net/gocrane/crane/metric-adapter:pr-402-06ed2ab
craned:pr-402-06ed2ab	docker pull finops-docker.pkg.coding.net/gocrane/crane/craned:pr-402-06ed2ab