[WIP] Update to schemars 1.0

[Danil-Grigorev]

Motivation

Manually update schemars to 1.0 to support future changes.

Solution

Re-implement some of the breaking changes to allow existing CRD parsing logic to be preserved, as they rely on structured schema instead of serde_json::Value.

[clux]

Presumably many of these types here were lifted from schemars 0.8?
Are they necessary for us or is it mostly an api convenience?

Secondly, are they necessary to stay here as pub? They don't seem used in the examples. EDIT: tried out; you can basically remove pub from all of them except the original StructuralSchemaRewriter.

[Danil-Grigorev]

I removed those pub keywords. It is needed to preserve logic unchanged, it works well, and edge cases where it fails are related (sourced) to the schemars changes regarding updates to serde(flatten) handling. I can expand on the issue later if needed.

These structures come from v0.8 tag in schemars, although I can also remove dangling parts which are not currently used if the size of added definitions matters. Simply having them in place makes implementing overrides easier, then operating on raw serde_json::Value, and I suspect rewriting current logic to the upstream suggested migration guide would still require implementing similar structures there and then.

[codecov]

Codecov Report

Attention: Patch coverage is 81.96721% with 11 lines in your changes missing coverage. Please review.

Project coverage is 76.5%. Comparing base (3366a61) to head (1c46714).

Files with missing lines	Patch %	Lines
kube-core/src/duration.rs	0.0%	4 Missing ⚠️
kube-core/src/schema.rs	81.9%	4 Missing ⚠️
kube-core/src/cel.rs	89.7%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1780     +/-   ##
=======================================
+ Coverage   76.5%   76.5%   +0.1%     
=======================================
  Files         84      84             
  Lines       7896    7915     +19     
=======================================
+ Hits        6038    6054     +16     
- Misses      1858    1861      +3     

Files with missing lines	Coverage Δ
kube-derive/src/cel_schema.rs	94.0% <100.0%> (+0.3%)	⬆️
kube-derive/src/custom_resource.rs	84.2% <ø> (ø)
kube-core/src/cel.rs	63.5% <89.7%> (+0.5%)	⬆️
kube-core/src/duration.rs	60.5% <0.0%> (ø)
kube-core/src/schema.rs	87.7% <81.9%> (-2.5%)	⬇️

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