vdk-core: VdkBoundLogger

[gageorgiev]

This change introduces the VdkBoundLogger and addresses #2802.

Testing done: locally tested, ran a job with the following job code:

def run(job_input):
    import logging
    from vdk.internal.builtin_plugins.config.log_config import bind_logger

    bound = bind_logger(logging.getLogger(__name__), {"bound_key": "bound_value"})
    bound.warning("From vdk_initialize", extra={"first_key": "first_value", "second_key": "second_value"})
    bound.warning("Something else from vdk_initialize")

And the following config:

logging_metadata=timestamp,level,file_name,line_number,vdk_job_name,bound_key,second_key

And observed the following logs:

2023-10-23 15:17:42,547 [VDK] [WARNI]                10.py :5    gg-job4 bound_value second_value - From vdk_initialize
2023-10-23 15:17:42,548 [VDK] [WARNI]                10.py :6    gg-job4 bound_value  - Something else from vdk_initialize