LIN-625: Parametrize and refactor inter task communication

[andycui97]

Description

Parametrize and refactor inter task communication blocks.

Major changes:

• Move get_artifact_task_definitions and get_session_task_definitions to task_gen.py, and hide them behind a generic get_task_definition that takes in DagTaskBreakdown instance as parameter.
• Move all airflow specific configs to lineapy/plugins/airflow_pipeline_writer.py and DVC to lineapy/plugins/dvc_pipeline_writer.py
• Add TaskSerializer enum and render_task_io_serialize_blocks which render task serialization blocks and can be parametrized through dag configs, this config added to Airflow as task_serialization.
• Add get_localpickle_setup_task_definition, and get_localpickle_teardown_task_definition, which returns a Task for setting up local pickle directory and tearing it down.

Minor changes

• Add comments to all new functions
• Move extract_taskgraph from lineapy/api/api_utils.py to lineapy/plugins/task.py to avoid circular dep

Fixes: LIN-625

Type of change

Please delete options that are not relevant.

• [X] Refactor (non-breaking change)
• [X] This change requires a documentation update

How Has This Been Tested?

Existing pytests. Updated snapshots but verified airflow frameworks still run with airflow marked pytests.