CLI request timeout flag

[vishalbollu]

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Description

Add a timeout to CLI requests to the operator. Here are some potential reasons for why requests may hang (verify and address):

• operator doesn't exist (crashed and recovering from an error)?
• operator is busy
• cluster has been spun down

Add a default timeout (e.g. 5 seconds) and a timeout flag to the CLI to customize the timeout.

Keep in mind that with lots of instances (e.g. 300+), cortex get could take a while.

After adding the flag, revisit global timeout for operator requests