[improve][fn] support reading config options from file in Function Python Runner

[tpiperatgod]

Fixes #18533

Master Issue: #xyz

Motivation

please refer to this proposal: #18744

Modifications

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: tpiperatgod#11

[codecov-commenter]

Codecov Report

Merging #18951 (5e4c381) into master (aa7af10) will decrease coverage by 1.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master   #18951      +/-   ##
============================================
- Coverage     64.20%   63.17%   -1.03%     
+ Complexity    26265    25952     -313     
============================================
  Files          1832     1832              
  Lines        134067   134068       +1     
  Branches      14753    14753              
============================================
- Hits          86077    84704    -1373     
- Misses        40135    41661    +1526     
+ Partials       7855     7703     -152     

Flag	Coverage Δ
inttests	24.79% <100.00%> (-0.13%)	⬇️
systests	25.56% <100.00%> (+0.09%)	⬆️
unittests	60.46% <100.00%> (-1.00%)	⬇️

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

Impacted Files	Coverage Δ
...che/bookkeeper/mledger/impl/ManagedCursorImpl.java	78.28% <100.00%> (+0.36%)	⬆️
...ain/java/org/apache/pulsar/broker/rest/Topics.java	0.00% <0.00%> (-100.00%)	⬇️
...ar/broker/stats/prometheus/ManagedLedgerStats.java	0.00% <0.00%> (-100.00%)	⬇️
...oker/stats/prometheus/PrometheusMetricStreams.java	0.00% <0.00%> (-100.00%)	⬇️
.../stats/prometheus/AggregatedSubscriptionStats.java	0.00% <0.00%> (-100.00%)	⬇️
...metheus/AggregatedTransactionCoordinatorStats.java	0.00% <0.00%> (-100.00%)	⬇️
...broker/stats/prometheus/TransactionAggregator.java	0.00% <0.00%> (-96.06%)	⬇️
.../pulsar/broker/rest/RestMessagePublishContext.java	0.00% <0.00%> (-92.60%)	⬇️
...a/org/apache/pulsar/client/util/TypeCheckUtil.java	0.00% <0.00%> (-83.34%)	⬇️
...ker/stats/prometheus/AggregatedNamespaceStats.java	0.00% <0.00%> (-81.25%)	⬇️
... and 202 more

[github-actions]

The pr had no activity for 30 days, mark with Stale label.

[freeznet]

could you please add some tests?

[momo-jun]

Hi @tpiperatgod, did you have any plans to update the related docs?

[tpiperatgod]

Hi @tpiperatgod, did you have any plans to update the related docs?

I will try to submit a PR for the document, please help me review it then, thanks.

[momo-jun]

@tpiperatgod I'm happy to help. Feel free to ping me.

[Anonymitaet]

Hi @tpiperatgod 3.0 is planned to be released on May 2. We're aiming to align docs with code. Can you share some progress on the doc? TIA!

Hi @tpiperatgod, did you have any plans to update the related docs?

I will try to submit a PR for the document, please help me review it then, thanks.

[tpiperatgod]

@Anonymitaet Here is the docs pr, please help review: apache/pulsar-site#541

[Anonymitaet]

@tpiperatgod thanks for your technical input! I've restructured the docs based on user learning habits and raised a question in apache/pulsar-site#544 (comment), PTAL.