Refactor implementation to get OTel tracer

[kaxil]

Previous implementation had redundant logic in add_span for parameter inspection:

with Trace.start_span(span_name=func_name, component=component):
    if len(inspect.signature(func).parameters) > 0:
        return func(*args, **kwargs)
    else:
        return func()

_Trace Metaclass was using __init__ and few more Python-related changes -- check inline comments.

related issue: https://github.com/apache/airflow/issues/43789

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[kaxil]

Failure is unrelated:

=========================== short test summary info ============================
FAILED tests/jobs/test_scheduler_job.py::TestSchedulerJob::test_setup_callback_sink_not_standalone_dag_processor - sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.