Allow specifying type aliases to provide schema definitions

[lsdch]

This is meant to allow registering type aliases to be used when generating Schema. It is an alternative to implementing the SchemaProvider interface, which is not always very convenient (e.g. when dealing with types from external packages which can not be directly extended).

Example usage:

registry := huma.NewMapRegistry("#/components/schemas", huma.DefaultSchemaNamer)

registry.RegisterTypeAlias(reflect.TypeFor[some_external_pkg.OptionalStr](), reflect.TypeFor[string]())
registry.RegisterTypeAlias(reflect.TypeFor[some_external_pkg.OptionalDateTime](), reflect.TypeFor[time.Time]())

Inspired from a similar feature provided in Go swag

[lsdch]

Sorry, the test was using reflect.TypeFor which was only introduced in Go 1.22

[lsdch]

I made sure the linter is happy this time, my local setup was using the --fast flag and did not detect this error

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.29%. Comparing base (7b6dc40) to head (3b9f6e7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #330   +/-   ##
=======================================
  Coverage   95.28%   95.29%           
=======================================
  Files          19       19           
  Lines        2822     2827    +5     
=======================================
+ Hits         2689     2694    +5     
  Misses         97       97           
  Partials       36       36           

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