CLI: Add API health probe

[rajdip-b]

Description

Since our CLI can be configured to work with any version of the backend (self hosted / production / staging), we would need to ensure that the CLI first checks if the backend is reachable before issuing commands that make HTTP requests. Otherwise, we might land up with this error:

Solution

• base.command.ts has canMakeHttpRequests. If this is set to true, we need to make a request to /api/health path to ensure the servers are reachable from BaseCommand#prepare function.
• If the servers are reachable, we proceed with the method call.
• If not, we inform the users about this, and quit with an error.

[adityaRajGit]

I can work on this. Can I try?