Add a terminate clusters subcommand as alias

[daureg]

Describe the issue

One can start & restart cluster with the CLI (which match the label in UI), but to terminate a cluster one must call databricks clusters delete, which is not intuitive

Steps to reproduce the behavior

databricks clusters terminate --help

Expected Behavior

I would expect the same behavior as databricks clusters delete --help

Actual Behavior

It just shows the general cluster help

OS and CLI version

Databricks CLI v0.228.1 on linux

Is this a regression?

No

Debug Logs

N/A

[aadi-1024]

Hello! From what I'm able to infer, it's expected that running databricks clusters terminate or databricks clusters terminate --help should suggest the user to use the delete subcommand instead by outputting the same help as databricks cluster delete, right?

I'd like to work on this if that's the case!