There is no timeout on retrieving metadata JSON and commands like `validator:rpc-urls` hang indefinitely

[aaronmboyd]

Package

@celo/celocli

Have you ensured that all of these are up to date?

• the package you are using

What version of the package are you on?

8.0.1

What command or function is the bug in?

celocli validator:rpc-urls

Operating System

Linux

Describe the bug

When a self-hosted metadata URL like https://celo-rpc.hashkey.cloud/metadata.json (currently) is non-responsive or down, the current fetch mechanism does not have a timeout and simply hangs for minutes. This causes the rpc commands to get the rpc list to effectively hang forever. It used to take a couple of seconds but now with a single down JSON host the entire command just spins forever.

[aaronmboyd]

@aaronmgdr Just pinging you here as you seem to be posting about the CLI in the forum in the past.