jwtk / jjwt / #1531

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Replace String/byte[] with (N)IO streams (#838)

Closes #837 

Replaced raw `String` and `byte[]` usages with `CharSequence`, `InputStream`/`OutputStream` and `CharBuffer`/`ByteBuffer` concepts where possible to eliminate unnecessary creation of intermediate byte arrays and/or temporary Strings.

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- Changed TokenizedJwt and TokenizedJwe interfaces and implementations to return CharSequences instead of Strings to avoid creating new Strings on the heap
- Changed internal Base64 implementation to work with a CharSequence instead of a raw char[] to reduce need to create new arrays on the heap
- Changed Base64Decoder generics signature from Decoder<String,byte[]> to Decoder<CharSequence,byte[]>
- Decoders.BASE64 and Decoders.BASE64URL now reflect Decoder<CharSequence,byte[]>
- Changed Strings#utf8 implementation to accept a CharSequence instead of a String
- Added new Strings#wrap to wrap a CharSequence into a CharBuffer if necessary
- Renamed not-yet-released JwtBuilder#serializer method with JwtBuilder#json
- Renamed not-yet-released JwtParserBuilder#deserializer method with JwtParserBuilder#json

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- Moved JwtDeserializer from io.jsonwebtoken.impl to io.jsonwebtoken.impl.io package, created two new subclass implementations for use with Jwks and JwkSets
- Renamed JwtDeserializer to JsonObjectDeserializer that defaults to throwing MalformedJwtException.  Added two subclasses, JwkDeserializer and JwkSetDeserializer that throws JWK and JWK Set-specific exceptions.

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Changed ParserBuilder#deserializer method name to ParserBuilder#jsonReader

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Removed all usages of Serializer#serialize and Deserializer#deserialize except for deprecated implementations.  All other usages now use InputStream/OutputStream concepts

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Added Jwks#json and Jwks#UNSAFE_JSON for assistance in serializing JWKs to JSON (test cases, README examples, etc)

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- Ensured Encoder and CompressionAlgorithm supported streams instead of just... (continued)

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