As this interface is moving towards being a pluggable public interface.

Now, the `Format` interface deals with converting SchemaRegistry `ParsedSchema`s into the list of `SimpleColumn` ksql should use. Each `SimpleColumn` defines the name and type of the column.

Conversion between connect and ksql types is now handled by the `ConnectFormat` base class.  This base class currently converts all field names to uppercase. However, it is now possible for a format to return any-case names and those names will be respected.

Conflicting files
ksql-functional-tests/src/main/java/io/confluent/ksql/test/tools/TestCaseBuilderUtil.java
ksql-functional-tests/src/main/java/io/confluent/ksql/test/utils/SerdeUtil.java
ksql-serde/src/main/java/io/confluent/ksql/serde/json/JsonFormat.java