go/runtime: Add log manager

[kostko]

Fixes #6064

[netlify]

✅ Deploy Preview for oasisprotocol-oasis-core canceled.

Name	Link
🔨 Latest commit	fb9db6f
🔍 Latest deploy log	https://app.netlify.com/projects/oasisprotocol-oasis-core/deploys/683581c448506500088bf8c9

[codecov]

Codecov Report

Attention: Patch coverage is 55.71956% with 120 lines in your changes missing coverage. Please review.

Project coverage is 64.54%. Comparing base (031d550) to head (6f01518).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
go/runtime/registry/host_rofl_mgmt.go	0.00%	40 Missing ⚠️
go/runtime/log/log.go	67.50%	21 Missing and 5 partials ⚠️
go/runtime/log/manager.go	51.02%	22 Missing and 2 partials ⚠️
go/runtime/host/protocol/connection.go	41.66%	7 Missing ⚠️
go/runtime/registry/host_rofl.go	0.00%	5 Missing ⚠️
go/common/logging/filter.go	77.77%	2 Missing and 2 partials ⚠️
go/runtime/config/config.go	55.55%	2 Missing and 2 partials ⚠️
go/runtime/host/logger.go	72.72%	3 Missing ⚠️
go/runtime/host/protocol/metrics.go	50.00%	3 Missing ⚠️
go/runtime/registry/host.go	57.14%	2 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6197      +/-   ##
==========================================
- Coverage   65.17%   64.54%   -0.64%     
==========================================
  Files         651      658       +7     
  Lines       65295    65541     +246     
==========================================
- Hits        42559    42306     -253     
- Misses      17905    18296     +391     
- Partials     4831     4939     +108     

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