Artifact protos and related changes

[wild-endeavor]

This change introduces the artifact protobufs and related control plane changes. The actual service backing artifacts is still being worked on, and related Helm chart changes and such are not yet available.

Admin changes have been feature-gated. To turn on the changes (though again, they won't work without the backend service which is coming soon), add the following to your single binary configuration.

flyteadmin:
  featureGates:
    enableArtifacts: true

To enable the new cloudevents

cloudEvents:
  enable: true
  cloudEventVersion: v2

Summary of changes

• IDL changes
  • New artifact related identifiers in core.
  • New artifact related messages and service
  • Artifact related fields in Variable and Parameter
  • Metadata field in Literal for tracking
  • New cloud events with additional information
• Admin
  • Registration of launch plans, tasks, and workflows, will send signatures to the artifact service.
  • Execution manager will resolve any artifact queries before running an execution
• Others
  • Change and combine postgres error handling logic into flytestdlib and call from admin and data catalog
  • Add a sandbox-only event processor to flytestdlib which can only be used in single binary.

[codecov]

Codecov Report

Attention: 731 lines in your changes are missing coverage. Please review.

Comparison is base (0e35cab) 59.03% compared to head (80316c7) 58.10%.

Files	Patch %	Lines
...cloudevent/implementations/cloudevent_publisher.go	0.86%	342 Missing ⚠️
flyteadmin/pkg/manager/impl/execution_manager.go	15.38%	249 Missing and 4 partials ⚠️
flyteadmin/pkg/artifacts/registry.go	25.37%	50 Missing ⚠️
flyteadmin/pkg/manager/impl/launch_plan_manager.go	26.92%	17 Missing and 2 partials ⚠️
flyteadmin/pkg/async/cloudevent/factory.go	51.72%	14 Missing ⚠️
flyteadmin/pkg/rpc/adminservice/base.go	0.00%	14 Missing ⚠️
flyteadmin/pkg/manager/impl/task_manager.go	47.05%	8 Missing and 1 partial ⚠️
flyteadmin/pkg/common/flyte_url.go	0.00%	8 Missing ⚠️
flyteadmin/pkg/manager/impl/workflow_manager.go	61.90%	7 Missing and 1 partial ⚠️
...yteadmin/pkg/manager/impl/validation/validation.go	50.00%	4 Missing and 1 partial ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4474      +/-   ##
==========================================
- Coverage   59.03%   58.10%   -0.93%     
==========================================
  Files         622      626       +4     
  Lines       52823    53821     +998     
==========================================
+ Hits        31182    31272      +90     
- Misses      19150    20046     +896     
- Partials     2491     2503      +12     

Flag	Coverage Δ
unittests	58.10% <15.68%> (-0.93%)	⬇️

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