feat!: Implement Serialize, Deserialize, and JsonSchema implementations for cot internal types

[ElijahAhianyo]

Related issue or discussion

This should allow the use of cot's internal types in structs where schemas::JsonSchema is derived:

#[derive(Debug, Clone, Serialize, schemars::JsonSchema)]
#[model] // needed only for `ForeignKey`
struct Foo {
  id: Auto<i64>,
  limited_str: LimitedString<128>,
  fk: ForeignKey<Bar>,
  email: Email,
  url: Url
}

Description

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / cleanup
• Performance improvement
• Other (describe above)

Checklist

• I've read the contributing guide
• Tests pass locally (just test-all)
• Code passes clippy (just clippy)
• Code is properly formatted (cargo fmt)
• New tests added (regression test for bugs, coverage for new features)
• Documentation (both code and site) updated (if applicable)

[github-actions]

Bencher Report

Branch	elijah/json-impls
Testbed	github-ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	Benchmark Result microseconds (µs) (Result Δ%)	Upper Boundary microseconds (µs) (Limit %)
empty_router/empty_router	📈 view plot 🚷 view threshold	6,635.50 µs (+8.44%) Baseline: 6,118.81 µs	7,662.80 µs (86.59%)
json_api/json_api	📈 view plot 🚷 view threshold	1,066.50 µs (-1.01%) Baseline: 1,077.34 µs	1,318.23 µs (80.90%)
nested_routers/nested_routers	📈 view plot 🚷 view threshold	967.29 µs (-2.73%) Baseline: 994.40 µs	1,200.43 µs (80.58%)
single_root_route/single_root_route	📈 view plot 🚷 view threshold	939.97 µs (-1.76%) Baseline: 956.85 µs	1,163.46 µs (80.79%)
single_root_route_burst/single_root_route_burst	📈 view plot 🚷 view threshold	15,938.00 µs (-10.01%) Baseline: 17,711.61 µs	21,188.15 µs (75.22%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

❌ Patch coverage is 99.41176% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cot/src/openapi.rs	99.27%	0 Missing and 1 partial ⚠️

Flag	Coverage Δ
rust	90.16% <99.41%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cot/src/common_types.rs	69.11% <ø> (ø)
cot/src/db.rs	86.83% <100.00%> (+0.66%)	⬆️
cot/src/openapi.rs	95.60% <99.27%> (+0.84%)	⬆️

... and 1 file with indirect coverage changes

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[m4tx]

Looks mostly good to me, but let's improve the error handling before merging.

[m4tx]

Thanks for this!