go/worker/keymanager: Decouple secrets from key manager worker

[peternose]

Moved secrets away from the main key manager worker. Major changes:

• Registration (see handleRuntimeHostEvent):
  • The key manager worker is responsible for updating capabilities and version on every start and update.
  • The secrets worker is responsible for updating extra info on restarts (RAK changes) and when checksum changes.
• Key manager status was changed.
  • The idea is to capture global values (e.g. runtime_id, access_list) at the top, and move secrets specific values under section secrets which will be latter accompanied by section churp.
• Status state can be found in the key manager worker status and in the secrets status (can be also changed).
• The key manager is initialized when all sub-workers are initialized (currently we have only one worker for secrets).

[codecov]

Codecov Report

Attention: 104 lines in your changes are missing coverage. Please review.

Comparison is base (6012717) 66.25% compared to head (9d1ddaf) 66.19%.
Report is 3 commits behind head on master.

❗ Current head 9d1ddaf differs from pull request most recent head ae42c0e. Consider uploading reports for the commit ae42c0e to get more accurate results

Files	Patch %	Lines
go/worker/keymanager/secrets.go	84.09%	61 Missing and 29 partials ⚠️
go/worker/keymanager/worker.go	86.95%	6 Missing and 3 partials ⚠️
go/worker/keymanager/init.go	76.47%	2 Missing and 2 partials ⚠️
go/runtime/registry/host.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5538      +/-   ##
==========================================
- Coverage   66.25%   66.19%   -0.07%     
==========================================
  Files         537      538       +1     
  Lines       56810    56868      +58     
==========================================
+ Hits        37637    37641       +4     
- Misses      14768    14798      +30     
- Partials     4405     4429      +24     

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