[WIP] - Implement distributed scheduler building block

[mikeee]

Description

Issue reference

Please reference the issue this PR will close: #561

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

Attention: Patch coverage is 53.96825% with 29 lines in your changes are missing coverage. Please review.

Project coverage is 63.94%. Comparing base (27248ba) to head (5018005).
Report is 11 commits behind head on main.

Files	Patch %	Lines
service/grpc/scheduling.go	0.00%	21 Missing ⚠️
service/http/scheduling.go	0.00%	6 Missing ⚠️
client/scheduling.go	93.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #562      +/-   ##
==========================================
+ Coverage   58.04%   63.94%   +5.90%     
==========================================
  Files          55       55              
  Lines        3568     3284     -284     
==========================================
+ Hits         2071     2100      +29     
+ Misses       1375     1061     -314     
- Partials      122      123       +1     

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