[Core][Isthmus][CLI] Support extended expression definitions for SQL expressions

[davisusanibar]

These are the activities involved on this issue:

• [x] [Core] Enable support from/to pojo/protobuf for extended expressions - https://github.com/substrait-io/substrait-java/pull/206
• [x] [Isthmus] Convert sql expression into proto extended expressions - https://github.com/substrait-io/substrait-java/pull/191
• [ ] [PicoCLI] Expose ExtendedExpression on Isthmus graal image using PicoCLI - https://github.com/substrait-io/substrait-java/pull/209
• [ ] [Isthmus][PicoCLI] Add documentation for new support extended expression definitions for SQL expressions