Adding namespace_selector field. initial state

[JaylonmcShan03]

Description

Adding namespace_selector field. initial state Draft pr for feedback purposes.

I am thinking we may have to create our own schema instead of using Schema: labelSelectorFields(true)

Acceptance tests

• [ ] Have you added an acceptance test for the functionality being added?
• [ ] Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

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Release Note

Release note for CHANGELOG:

...

References

Community Note

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