Add CRD support to kubectl-explain drawer

[enneitex]

Summary

Fixes #15249

this change adds support for displaying CRDs fields definition similar to what is already done for native resources.
It also fixes the kind displayed for fields like pod.spec.containers.args which are []string but the UI previously showed []Object

I tested manually with a few CRDs (see video below)

Occurred changes and/or fixed issues

Technical notes summary

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video

before:

before.mov

after:

after.mov

Checklist

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[enneitex]

I'm not sure about this, I hit Uncaught TypeError: Cannot read properties of null (reading '$el') once