jwtk / jjwt / #1347

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JWE support (#279)

* JWE support. Resolves #113

Huge feature/code change - see CHANGELOG.MD for an in-depth review of changes.

Commit note log:

- Added JWE AeadAlgorithm and KeyAlgorithm and supporting interfaces/implementations, and refactored SignatureAlgorithm to be an interface instead of an enum to enable custom algorithms
- NoneSignatureAlgorithm cleanup. Added UnsupportedKeyExceptionTest.
- Added JWK support!

* Removed the previous SignatureAlgorithm implementation concepts (Provider/Signer/Validator implementations).  Implementations are now interface-driven and fully pluggable.

* adding tests, working towards 100% coverage.  Moved api static factory class tests to impl module to avoid mocking static calls due to bridge/reflection logic.

* adding tests, removed unused class

* implementation checkpoint (safety save)

* clean build checkpoint

* continued testing w/ more coverage.  Replaced PbeKey concept with PasswordKey

* fixed erroneous optimize imports

* Added ECDH-ES key algorithms + RFC tests

* 1. Enabled targeted/limited use of BouncyCastle only when required by eliminating use of RuntimeEnvironment in favor of new Providers implementation.  JJWT will no longer modify the system providers list.
2. Changed SecretKeyGenerator.generateKey() to KeyBuilderSupplier.keyBuilder() and a new SecretKeyBuilder interface.  This allows users to customize the Provider and SecureRandom used during key generation if desired.
3. Added KeyLengthSupplier to allow certain algorithms the ability to determine a key bit length without forcing a key generation.
4. Ensured Pbes2 algorithms defaulted to OWASP-recommended iteration counts if not specified by the user.

* 1. EcdhKeyAlgorithm: consolidated duplicate logic to a single private helper method
2. Updated RequiredTypeConverter exception message to represent the expected type as well as the found type

* Minor javadoc update

* 1. Javadoc cleanup.
2. Ensured Co... (continued)

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