Release v0.2.0

This is the second release of the processor, which features the following changes:

• Add the ability to specify a schema per Flowfile or processor-wide
• Add the ability to use a raw .proto schema, which will be dynamically compiled if the Compile schema option is set. To improve perfs, the compiled schema is cached when specified processor-wide.
• Refactoring and code cleanup
• Update documentation & tests