feat: support provider endpoint in jina executor

[zac-li]

Goals

Added --provider-endpoint in jina executor serve so that we can specify the endpoint used in SageMaker integration for /invocations.

This is needed for Colbert use case as in the Executor we have multiple endpoints, and each SageMaker model package needs to use different endpoint for /invocations from the same Executor container.

[codecov]

Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 75.02%. Comparing base (8a58dfa) to head (14dc3d1).
Report is 3 commits behind head on master.

Files	Patch %	Lines
jina/serve/executors/__init__.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6149      +/-   ##
==========================================
- Coverage   75.04%   75.02%   -0.02%     
==========================================
  Files         152      152              
  Lines       14095    14100       +5     
==========================================
+ Hits        10577    10578       +1     
- Misses       3518     3522       +4     

Flag	Coverage Δ
jina	75.02% <11.11%> (-0.02%)	⬇️

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