[pcode] refactor lifting scripts that use the Ghidra API for testability and maintainability, add tests and test environment, and add them into CI

[kaoudis]

• adds a "test" container that pulls in additional dependencies the customer / end user doesn't need (Ghidra source and Ghidra test dependencies, and some test firmwares)
• adds that test container into CI
• refactors the Ghidra pcode extraction and serialization scripts for maintainability and testability
• starts adding unit tests
• adds Jacoco so we can calculate test coverage on demand (we have at least a little coverage for everything now)
• fixes a number of small but impactful bugs in serialization that were caught through code reading and adding tests (I can go back through the previous commit list before I squashed and list them here if desired)

[kumarak]

The PR looks good and includes much needed refactoring of high pcode serializer. It seems CI is failing because of missing docker image and serializer unit tests is raise exception could be due to related reason. Should be ready to go after fixing CI.