[BEAM-14517] Add files_to_stage option to Python SDK

[ihji]

Adding files_to_stage option. Basically it does the same thing with jar_packages option but for all types of files.

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[codecov]

Codecov Report

Merging #17765 (f2470de) into master (5bb3127) will increase coverage by 0.00%.
The diff coverage is 95.23%.

@@           Coverage Diff           @@
##           master   #17765   +/-   ##
=======================================
  Coverage   74.01%   74.01%           
=======================================
  Files         695      695           
  Lines       91798    91814   +16     
=======================================
+ Hits        67941    67954   +13     
- Misses      22611    22614    +3     
  Partials     1246     1246           

Flag	Coverage Δ
python	83.75% <95.23%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...s/python/apache_beam/runners/portability/stager.py	85.50% <95.00%> (-0.04%)	⬇️
...dks/python/apache_beam/options/pipeline_options.py	94.94% <100.00%> (+0.01%)	⬆️
...python/apache_beam/runners/worker/worker_status.py	78.26% <0.00%> (-1.45%)	⬇️
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	⬇️
sdks/python/apache_beam/transforms/combiners.py	93.05% <0.00%> (-0.39%)	⬇️
...ks/python/apache_beam/runners/worker/operations.py	74.02% <0.00%> (-0.07%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.54% <0.00%> (-0.01%)	⬇️
sdks/python/apache_beam/io/textio.py	96.89% <0.00%> (ø)
...s/python/apache_beam/io/gcp/pubsublite/external.py	0.00% <0.00%> (ø)
.../python/apache_beam/io/gcp/pubsublite/proto_api.py	0.00% <0.00%> (ø)
... and 7 more

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[ihji]

R: @chamikaramj

[ihji]

superseded by #21782