Move importing azfunc to init request

[gavin-aguiar]

Description

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

• I have read the contribution guidelines.

[codecov]

Codecov Report

Merging #1170 (62b064d) into dev (a858fbf) will decrease coverage by 52.59%.
The diff coverage is 20.00%.

❗ Current head 62b064d differs from pull request most recent head 82806db. Consider uploading reports for the commit 82806db to get more accurate results

@@             Coverage Diff             @@
##              dev    #1170       +/-   ##
===========================================
- Coverage   84.48%   31.90%   -52.59%     
===========================================
  Files          34       34               
  Lines        1889     1893        +4     
  Branches      276      365       +89     
===========================================
- Hits         1596      604      -992     
- Misses        225     1288     +1063     
+ Partials       68        1       -67     

Flag	Coverage Δ
unittests	31.90% <20.00%> (-52.53%)	⬇️

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

Impacted Files	Coverage Δ
azure_functions_worker/dispatcher.py	19.59% <0.00%> (-69.39%)	⬇️
azure_functions_worker/constants.py	100.00% <100.00%> (ø)
...e_functions_worker/bindings/nullable_converters.py	21.62% <0.00%> (-78.38%)	⬇️
azure_functions_worker/functions.py	25.00% <0.00%> (-71.28%)	⬇️
azure_functions_worker/utils/tracing.py	31.81% <0.00%> (-68.19%)	⬇️
azure_functions_worker/utils/common.py	33.33% <0.00%> (-66.67%)	⬇️
.../shared_memory_data_transfer/file_accessor_unix.py	19.60% <0.00%> (-65.69%)	⬇️
azure_functions_worker/bindings/meta.py	25.30% <0.00%> (-57.84%)	⬇️
...ared_memory_data_transfer/shared_memory_manager.py	26.80% <0.00%> (-55.68%)	⬇️
... and 16 more

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