Add new commands - 'compare' and 'complete' data pipeline execution

New commands:

• compare: Compares & persists SHA256-hashed checksums of the given models against those of the last successful execution. Returns comma-separated string of changed model names. Parameters required:
  • execution-id: a GUID identifier of an existing data pipeline execution as returned by the init command.
  • model-type: type of models being processed e.g.: load, transform, etc. this model-type is used to group the model checksums by and used to find and compare older ones.
  • base-path: absolute or relative path to the models e.g.: ./load, /home/local/load, C:/path/to/load
  • model-patterns: path-based patterns (relative to base-path) to different models with extensions. models within a model-type must be named uniquely regardless of their file extension. e.g.: *.txt, **/*.txt, ./relative/path/to/some_models/**/*.csv, relative/path/to/some/more/related/models/**/*.sql
• complete: Marks the completion of an existing execution by updating a record for the same in the given database. Returns nothing unless there's an error. Parameter required:
  • execution-id: a GUID identifier of an existing data pipeline execution as returned by the init command.