Feature/simple hb

[andre-merzky]

Implement a much simpler process watcher than what is used in RP atm. This will support the airflow executor in ScaleMS.

[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 45 lines in your changes missing coverage. Please review.

Project coverage is 61.53%. Comparing base (8f767b8) to head (0db3f0f).
Report is 8 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/radical/utils/heartbeat.py	26.78%	41 Missing ⚠️
src/radical/utils/zmq/bridge.py	25.00%	3 Missing ⚠️
src/radical/utils/logger.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #420      +/-   ##
==========================================
- Coverage   61.84%   61.53%   -0.31%     
==========================================
  Files          62       62              
  Lines        6903     6965      +62     
==========================================
+ Hits         4269     4286      +17     
- Misses       2634     2679      +45     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mtitov]

LGTM! Thanks!