Shorten the path to import conf from airflow task sdk

[amoghrajesh]

from airflow.sdk.configuration import conf is too long of a path for users and providers to consume conf from. It would be much more convenient if it were from airflow.sdk import conf

Tested that below works as expected:

from airflow.sdk import conf
conf.get("core", "security")
Out[3]: ''
conf.get("api", "port")
Out[4]: '8080'

---

^ Add meaningful description above
Read the Pull Request Guidelines for more information.
In case of fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in a newsfragment file, named {pr_number}.significant.rst or {issue_number}.significant.rst, in airflow-core/newsfragments.

[potiuk]

Nice!