SUBMARINE-1362. Refactor submarine-k8s-agent using JOSDK

[cdmikechen]

What is this PR for?

A unified agent service replaces the previous one for each experiment and notebook. The unified agent will listen to both experiments and notebooks and update their status in real time, instead of having to start them independently, which would have resulted in untimely status updates. We will use the Java Operator SDK (https://github.com/java-operator-sdk/java-operator-sdk)

What type of PR is it?

Feature

Todos

• [x] - Use Java Operator SDK to replace old agent
• [x] - Remove agent pod deployment when creating/deleting resource
• [x] - Operator support agent deployment
• [x] - Add agent test cases

What is the Jira issue?

https://issues.apache.org/jira/browse/SUBMARINE-1362

How should this be tested?

Agent test cases

Screenshots (if appropriate)

NA

Questions:

• Do the license files need updating? Yes
• Are there breaking changes for older versions? Yes
• Does this need new documentation? No

[codecov[bot]]

Codecov Report

Merging #1038 (0e91b02) into master (279393a) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1038   +/-   ##
=======================================
  Coverage   75.98%   75.98%           
=======================================
  Files         119      119           
  Lines        5000     5000           
=======================================
  Hits         3799     3799           
  Misses       1201     1201           

Flag	Coverage Δ
python-integration	59.72% <ø> (ø)
python-unit	52.48% <ø> (ø)

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