Replace strings with schema type resolvers

[blast-hardcheese]

Continuing the work started in #1359, push the resolvers down and adding more structure (ReifiedRawType hierarchy for influencing generators)

• Pushing Schema[_] further down instead of just the (rawType: Option[String], rawFormat: Option[String]) pair
• Using Schema[_] for getDefault
• Adding (Schema[_], Components) => Schema[_] for dereferencing $ref

[codecov]

Codecov Report

Merging #1407 (5d87508) into master (d4e6652) will increase coverage by 0.08%.
The diff coverage is 87.43%.

@@            Coverage Diff             @@
##           master    #1407      +/-   ##
==========================================
+ Coverage   83.19%   83.28%   +0.08%     
==========================================
  Files          88       88              
  Lines        5464     5510      +46     
  Branches      151      142       -9     
==========================================
+ Hits         4546     4589      +43     
- Misses        918      921       +3     

Impacted Files	Coverage Δ
...ators/scala/akkaHttp/AkkaHttpServerGenerator.scala	91.14% <ø> (+0.36%)	⬆️
...enerators/scala/http4s/Http4sServerGenerator.scala	96.34% <ø> (ø)
...c/main/scala/dev/guardrail/core/ResolvedType.scala	75.00% <53.84%> (+5.00%)	⬆️
...la/dev/guardrail/generators/SwaggerGenerator.scala	70.54% <63.63%> (-2.97%)	⬇️
...ore/src/main/scala/dev/guardrail/SwaggerUtil.scala	81.68% <89.24%> (+2.89%)	⬆️
...a/dev/guardrail/generators/ProtocolGenerator.scala	90.23% <96.55%> (-0.07%)	⬇️
...les/core/src/main/scala/dev/guardrail/Common.scala	98.93% <100.00%> (+0.01%)	⬆️
...ala/dev/guardrail/generators/ClientGenerator.scala	100.00% <100.00%> (ø)
...a/dev/guardrail/generators/LanguageParameter.scala	89.36% <100.00%> (+1.99%)	⬆️
...ala/dev/guardrail/generators/ServerGenerator.scala	100.00% <100.00%> (ø)
... and 12 more

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[blast-hardcheese]

The one caveat to this approach is that it (finally?) unifies the Scala server generators (akka-http and http4s) under Vector[_] instead of Iterable[_] for all route types.

This is a pretty significant breaking change, but hopefully a desirable one from the perspective of both consistency and speed, as well as by using a distinct collection instead of an interface, we now get typeclass instances from cats.

Due to the fairly idiosyncratic respond parameter, it should actually be possible to write a scalafix rule that takes care of at least some of these changes, but due to the fact that bugs like #190 have existed for some time, this won't be able to catch all breaking changes.

[blast-hardcheese]

Also resolves #738

[blast-hardcheese]

This is blocked by actually writing the scalafix rule to replace Iterator[A] with Vector[A] in route parameters, at the very least.

[blast-hardcheese]

Alright, scalafix rule was submitted: scala-steward-org/scala-steward#2612