Support plugin override matchable resource

[katrogan]

TL;DR

This change introduces adding plugin overrides to the flyte workflow CRD when they exist for a matching CreateExecutionRequest.

Additionally, this change also adds a logical merge functionality for plugin overrides so that individual users do not have to do a get before update. Rather, any task type plugin overrides they specify will be saved in addition to existing overrides for other task types. The admin-internal sequence for get & update is not transactional and this could cause small errors to arise, but since system administrators will be infrequently calling the master update endpoint this should not really be a concern.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

https://docs.google.com/document/d/1OWYJ2ggr0pWvOdOKkf04NLtj2Rf32dMVYvAYMoyeU48/edit?usp=sharing

Tracking Issue

flyteorg/flyte#499

Follow-up issue

NA

[codecov-commenter]

Codecov Report

Merging #127 into master will increase coverage by 0.33%.
The diff coverage is 78.98%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
+ Coverage   61.27%   61.60%   +0.33%     
==========================================
  Files         105      105              
  Lines        7267     7405     +138     
==========================================
+ Hits         4453     4562     +109     
- Misses       2247     2264      +17     
- Partials      567      579      +12     

Flag	Coverage Δ
#unittests	61.60% <78.98%> (+0.33%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...kg/manager/impl/validation/attributes_validator.go	89.79% <50.00%> (-1.70%)	⬇️
pkg/manager/impl/resources/resource_manager.go	63.92% <73.07%> (+4.49%)	⬆️
pkg/repositories/transformers/resource.go	70.08% <78.57%> (+7.79%)	⬆️
pkg/manager/impl/execution_manager.go	69.05% <89.47%> (+0.48%)	⬆️
pkg/workflowengine/impl/propeller_executor.go	53.12% <100.00%> (+2.79%)	⬆️

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[katrogan]

friendly ping @anandswaminathan @EngHabu