Expose get_file_list_func to users

[kaxil]

This exposes get_file_list_func to users so that they can use it in @task or @task.virtualenv

Context: https://astronomer.slack.com/archives/C02B8SPT93K/p1670408501306539?thread_ts=1669893212.365849&cid=C02B8SPT93K

[codecov]

Codecov Report

Base: 97.36% // Head: 93.13% // Decreases project coverage by -4.22% ⚠️

Coverage data is based on head (720caef) compared to base (6db1977).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1380      +/-   ##
==========================================
- Coverage   97.36%   93.13%   -4.23%     
==========================================
  Files          19       54      +35     
  Lines         683     2855    +2172     
  Branches        0      337     +337     
==========================================
+ Hits          665     2659    +1994     
- Misses         18      130     +112     
- Partials        0       66      +66     

Impacted Files	Coverage Δ
python-sdk/src/astro/files/__init__.py	83.33% <100.00%> (ø)
python-sdk/src/astro/files/operators/files.py	100.00% <100.00%> (ø)
sql-cli/sql_cli/constants.py
sql-cli/sql_cli/astro/command.py
sql-cli/sql_cli/exceptions.py
sql-cli/sql_cli/project.py
sql-cli/sql_cli/astro/group.py
sql-cli/sql_cli/run_dag.py
sql-cli/sql_cli/operators/load_file.py
sql-cli/sql_cli/__init__.py
... and 65 more

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