Fix invalid CRD when Enum variants have descriptions

[sbernauer]

Motivation

I would like to document the different enum variants of my CRDs with Rust doc. By doing so a description attribute should be added to the CRD enum variants. Currently placing an description on an enum variant produces an invalid CRD.

Solution

This PR fixes the problem by moving the description attribute to the correct location inside the CRD schema.
Details can be found in the code comments.

Signed-off-by: Sebastian Bernauer sebastian.bernauer@stackable.de

[sbernauer]

Many thanks for your review @teozkr!
I should have implemented all your feedback with only one small exception: I decided for now to not panic if the number of properties is not equal to 1. This matches the previous behavior of if variant_obj.properties.len() == 1
Is this ok four you?

[codecov-commenter]

Codecov Report

Merging #852 (98fc31a) into master (931cd48) will increase coverage by 0.05%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master     #852      +/-   ##
==========================================
+ Coverage   70.22%   70.27%   +0.05%     
==========================================
  Files          59       59              
  Lines        4215     4226      +11     
==========================================
+ Hits         2960     2970      +10     
- Misses       1255     1256       +1     

Impacted Files	Coverage Δ
kube-derive/tests/crd_schema_test.rs	100.00% <ø> (ø)
kube-core/src/schema.rs	88.57% <90.90%> (+1.07%)	⬆️

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