[utype] extract repeatable annotations

[SentryMan]

UType can now properly extract repeatable annotations.

This was prompted by repeatable annotations appearing with their container in TypeMirror.

That is,

    @Pattern(regexp = ".*[0-9].*", message = "{signup.password.digit}")
    @Pattern(regexp = ".*[!@#$^&*].*", message = "{signup.password.special}")
     SomeType type;

becomes the following in the TypeMirror

    @Pattern.List({
      @Pattern(regexp = ".*[0-9].*", message = "{signup.password.digit}"),
      @Pattern(regexp = ".*[!@#$^&*].*", message = "{signup.password.special}")
   })
    SomeType type;

Which causes trouble when trying to read annotations from the type mirror using Utype.

Checklist before merge

Have these changes been tested with the below to confirm no negative interactions?

• avaje-inject
• avaje-jsonb
• avaje-validator
• avaje-spi-service