Override Ray config with fields for namespace, service account, pod resources

[guozhen-la]

Recreates PR that was moved in the monorepo
see #4136

As per our conversation with the Union AI, we are making the following changes to the Ray plugin to enable more parameters to be configurable on the user side using flytekit SDK.

see: flyteorg/flyteidl#429

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.54%. Comparing base (a9f5d24) to head (14d8d12).
Report is 956 commits behind head on master.

❗ Current head 14d8d12 differs from pull request most recent head 3cbc269

Please upload reports for the commit 3cbc269 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4170      +/-   ##
==========================================
+ Coverage   54.59%   59.54%   +4.94%     
==========================================
  Files         178      216      +38     
  Lines       16038    15938     -100     
==========================================
+ Hits         8756     9490     +734     
+ Misses       6568     5473    -1095     
- Partials      714      975     +261     

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[eapolinario]

Cleaning stale PRs. Please reopen if you wan to discuss this further.