Closes #1300: Use gRPC for agent commands

[aaronweissler]

Closes #1300

This change is 

[codecov[bot]]

Codecov Report

Merging #1359 (ddbf7a0) into master (16aef58) will increase coverage by 0.40%. The diff coverage is 73.25%.

:exclamation: Current head ddbf7a0 differs from pull request most recent head 8d36296. Consider uploading reports for the commit 8d36296 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1359      +/-   ##
============================================
+ Coverage     78.41%   78.81%   +0.40%     
+ Complexity     2424     2419       -5     
============================================
  Files           251      248       -3     
  Lines          7930     7932       +2     
  Branches        939      939              
============================================
+ Hits           6218     6251      +33     
+ Misses         1299     1269      -30     
+ Partials        413      412       -1     

Impacted Files	Coverage Δ
...nspectit/ocelot/core/command/CommandDelegator.java	16.67% <ø> (ø)
...mmand/handler/impl/ListClassesCommandExecutor.java	27.42% <52.94%> (ø)
...pectit/ocelot/core/command/AgentCommandClient.java	62.90% <62.90%> (ø)
...ectit/ocelot/core/command/AgentCommandService.java	77.97% <77.08%> (+7.23%)	:arrow_up:
...mmand/handler/impl/EnvironmentCommandExecutor.java	100.00% <100.00%> (ø)
...core/command/handler/impl/LogsCommandExecutor.java	87.50% <100.00%> (+2.50%)	:arrow_up:
...core/command/handler/impl/PingCommandExecutor.java	66.67% <100.00%> (+16.67%)	:arrow_up:

... and 1 file with indirect coverage changes

[heiko-holz]

Before mergin this PR, we have to make sure that newly added agent commands (e.g., SupportArchive #1333) are also upgraded to protobuf gRPC

[Dimi-Ma]

This PR is ready but needs to wait for #1554 to be merged. NOTE: Don't forget to rebase/merge the main branch to this one and test out if everything still works.