Add support of types representable as String to ServiceId annotation

[charphi]

@ServiceId annotation currently supports only String as a return type.
I would be useful to support other types that can be represented as String such as URI or anything that implements CharSequence.

Current behavior:

@ServiceDefinition(quantifier = Quantifier.MULTIPLE)
public interface HashAlgorithm {

  @ServiceId(pattern = ServiceId.SCREAMING_KEBAB_CASE)
  String getName();

  String hashToHex(byte[] input);

  static void main(String[] args) {
    HashAlgorithmLoader.load()
      .stream()
      .filter(algo -> algo.getName().equals("SHA-256"))
      .findFirst()
      .map(algo -> algo.hashToHex("hello".getBytes(UTF_8)))
      .ifPresent(System.out::println);
  }
}

Expected possibility:

@ServiceDefinition(quantifier = Quantifier.MULTIPLE)
public interface HashAlgorithm {

  @ServiceId(pattern = ServiceId.SCREAMING_KEBAB_CASE, formatMethodName = "toASCIIString")
  URI getIdentifier();

  String hashToHex(byte[] input);

  static void main(String[] args) {
    HashAlgorithmLoader.load()
      .stream()
      .filter(algo -> algo.getIdentifier().toASCIIString().equals("SHA-256"))
      .findFirst()
      .map(algo -> algo.hashToHex("hello".getBytes(UTF_8)))
      .ifPresent(System.out::println);
  }
}