Fix stuck monitor recovery. Avoid DB related deadlocks.

[badrogger]

Changes:

1. Added stuck recovery mechanism for config/skaled schains pipelines.
2. Switch to writing alive timestamp to a file instead of the db.
3. Remove locks from db read/write operations.

Performance:

1. No additional major computation or IO operations were introduced.

Tests:

1. Added additional unit tests.
2. Tested on the local network.

[codecov]

Codecov Report

Attention: Patch coverage is 81.17647% with 64 lines in your changes missing coverage. Please review.

Project coverage is 83.22%. Comparing base (ad492d3) to head (0ac7970).
Report is 38 commits behind head on v2.8.x.

Files with missing lines	Patch %	Lines
core/schains/monitor/main.py	82.56%	19 Missing ⚠️
core/schains/process.py	79.34%	19 Missing ⚠️
core/schains/monitor/tasks.py	87.87%	8 Missing ⚠️
web/models/schain.py	80.55%	7 Missing ⚠️
core/schains/process_manager.py	72.72%	6 Missing ⚠️
core/schains/monitor/config_monitor.py	0.00%	2 Missing ⚠️
core/schains/monitor/skaled_monitor.py	0.00%	2 Missing ⚠️
core/schains/cleaner.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           v2.8.x    #1098      +/-   ##
==========================================
+ Coverage   82.00%   83.22%   +1.22%     
==========================================
  Files         102      102              
  Lines        6124     6267     +143     
==========================================
+ Hits         5022     5216     +194     
+ Misses       1102     1051      -51     

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