Fix bellows CLI

[puddly]

I've removed network backup and restore from the bellows CLI. It is too complex to maintain and should be kept in zigpy-cli.

The rest of the tools were spot checked and run.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.16%. Comparing base (93c671b) to head (a8566fb).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #637   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files          50       50           
  Lines        3459     3459           
=======================================
  Hits         3430     3430           
  Misses         29       29           

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[puddly]

In the future, we need to remove the bellows CLI entirely. This has a few blockers:

• Add the --i-understand-... flag to zigpy-cli, maybe call it --burn?
• Implement radio-agnostic sniffing.
• Add more options for network formation (forcing a PAN ID, EPID, channel, key, IEEE address, and so on).
• Maybe add a way to send ZCL commands to devices?