[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.

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Choose reviewer(s) and mention them in a comment (R: @username).
• Format the pull request title like [BEAM-XXX] Fixes bug in ApproximateQuantiles, where you replace BEAM-XXX with the appropriate JIRA issue, if applicable. This will automatically link the pull request to the issue.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI.

[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

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5bb3127...f2470de. Read the comment docs.

[ihji]

R: @chamikaramj

[ihji]

superseded by #21782