Change state to desiredState for InferenceService

[lampajr]

Fixes https://github.com/opendatahub-io/model-registry/issues/229

Description

As the state property in InferenceService is an "intention", set by user, to do something we decided to change the property name from state to desiredState

• Change in openapi specification
• Change in core and mlmd type property

Change in python client is not needed as Serving interaction are not implemented there yet

NOTE: since there is NOT a release yet I renamed the property in mlmd, keep in mind that if you have some DBs running with the old schema you might have to delete it and recreate as MLMD does not accept to rename properties. Maybe this is something we could take into account later, i.e, trying to be resilient to schema changes (or just be everytime backward compatible)

How Has This Been Tested?

Go tests

make test

Merge criteria:

• The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7b351c2) 74.52% compared to head (0977753) 74.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
+ Coverage   74.52%   74.72%   +0.20%     
==========================================
  Files          17       17              
  Lines        2296     2287       -9     
  Branches       73       73              
==========================================
- Hits         1711     1709       -2     
+ Misses        420      414       -6     
+ Partials      165      164       -1     

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