Remove unused code and polish implementation so that the binder is not
created on each invocation.

See gh-10516

Move the 'shade' copy of the JSON API to a separate src folder to make
it clearer that we don't own the code. Also polished some formatting
and suppressed a few warnings.

Closes gh-10307

Fixes gh-11493

See gh-11572

* pr/11528:
  Add missing dependency management for org.seleniumhq.selenium

Closes gh-11528

This commit removes MediaType from the list of exclude types as it looks
like an error: MediaType has a constructor taking a `String` and binding
works fine with it.

This has the effect of properly generating the metadata for the only key
that Spring Boot exposes with a MediaType type:
spring.data.rest.default-media-type.

Closes gh-11568

See gh-10516

This commit adds a new exception type that denotes the value of a
configuration key is invalid, alongside a FailureAnalyzer that reports
a human-readable report when such exception is thrown on startup.

ResourceNotFoundException being a (useless) specialization of this new
exception, its usage has been refactored to use the more general
exception type.

Closes gh-10794

Closes gh-11569

Closes gh-11567

Closes gh-11566

Closes gh-11565

Closes gh-11564

Closes gh-11563

Closes gh-11562

Closes gh-11561

Closes gh-11560

Closes gh-11559

Closes gh-11558

Closes gh-11557

Closes gh-11556

Closes gh-11555

Closes gh-11554

Closes gh-11553

Closes gh-11552

Closes gh-11551