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.

[clux]

Yeah. Makes sense. As long as it's not part of our public API this is a good step forward either way. 👍

[codecov]

Codecov Report

Attention: Patch coverage is 87.27273% with 7 lines in your changes missing coverage. Please review.

Project coverage is 76.6%. Comparing base (3366a61) to head (17426a5).
Report is 8 commits behind head on main.

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

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1780     +/-   ##
=======================================
+ Coverage   76.5%   76.6%   +0.1%     
=======================================
  Files         84      84             
  Lines       7896    7909     +13     
=======================================
+ Hits        6038    6052     +14     
+ Misses      1858    1857      -1     

Files with missing lines	Coverage Δ
kube-core/src/schema.rs	91.6% <100.0%> (+1.5%)	⬆️
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)

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[clux]

Looks good to me in this state. Maybe a git pin is useful, but keen to get this in.
It should help unblock the edition update #1663, and make us more ready for the next k8s-openapi bump.

[clux]

actually possibly a legit failure now in 'test_crd_schema_matches_expected' panicked at kube-derive/tests/crd_enum_test.rs:60:5: after last refactor. triggered rerun now, but seems likely legit.