Add a boost doctor command to enable SP's to surface known issues

[jacobheun]

In order to help SP's diagnose and fix issues with their system it would be helpful to include a doctor command within Boost to run a full diagnostic of subsystems for known issues. This could help alleviate issues that SP's can remedy manually.

Systems to check (and include commands/docs to run to fix)

⚠️ This list is not exhaustive, we should aggregate other known system checks to include

• The number of sealed and unsealed sectors should match. Retrievals will fail if there is no unsealed sector.
• All shards for the dag store should be initialized. Missing shards can result in retrieval failures.
• ...

Nice to have

• On Boost restart, surface the latest doctor diagnostic check in the UI.
• On Boost restart, run and log doctor results so SP's know of immediate issues they should resolve

[LexLuthr]

1. mh lookup failed error
2. Can we surface piece store overview - keys and state (like yes I can fetch data for it)
3. If a shard cannot initialize - error why?
4. If there is anything in piece store that does not have corresponding shard

[brendalee]

@dirkmc is this the current work you're doing, or is the current boost doctor work just a portion of this?

[dirkmc]

I think we can close this one as code complete