Handling multi worker scenerio for pystein

[gavin-aguiar]

Description

Change to index the function in the load request. This is for cases where we have more than one worker. Since only the first worker calls the metadata request and the subsequent workers call the load request directly, we need to index the functions for worker2 and onwards in the load request.

Fixes #

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PR information

• [ ] The title of the PR is clear and informative.
• [ ] There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• [ ] If applicable, the PR references the bug/issue that it fixes in the description.
• [ ] New Unit tests were added for the changes made and CI is passing.

Quality of Code and Contribution Guidelines

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[codecov[bot]]

Codecov Report

Merging #1142 (02499f3) into dev (28e5fdb) will decrease coverage by 0.10%. The diff coverage is 84.61%.

:exclamation: Current head 02499f3 differs from pull request most recent head 01b6ee0. Consider uploading reports for the commit 01b6ee0 to get more accurate results

@@            Coverage Diff             @@
##              dev    #1142      +/-   ##
==========================================
- Coverage   84.97%   84.86%   -0.11%     
==========================================
  Files          32       32              
  Lines        1817     1824       +7     
  Branches      275      276       +1     
==========================================
+ Hits         1544     1548       +4     
- Misses        203      204       +1     
- Partials       70       72       +2     

Flag	Coverage Δ
unittests	84.81% <84.61%> (-0.11%)	:arrow_down:

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

Impacted Files	Coverage Δ
azure_functions_worker/loader.py	84.70% <ø> (-0.36%)	:arrow_down:
azure_functions_worker/dispatcher.py	88.86% <81.81%> (-0.36%)	:arrow_down:
azure_functions_worker/functions.py	96.27% <100.00%> (+0.06%)	:arrow_up:
azure_functions_worker/extension.py	98.16% <0.00%> (-0.92%)	:arrow_down:

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