feat: add side input grpc service

[kohlisid]

Add support for Side Inputs

[codecov[bot]]

Codecov Report

Merging #107 (7a60210) into main (0010845) will increase coverage by 0.09%. The diff coverage is 96.49%.

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
+ Coverage   94.74%   94.83%   +0.09%     
==========================================
  Files          26       29       +3     
  Lines        1027     1084      +57     
  Branches       69       71       +2     
==========================================
+ Hits          973     1028      +55     
- Misses         31       32       +1     
- Partials       23       24       +1     

Files Changed	Coverage Δ
pynumaflow/sideinput/server.py	94.87% <94.87%> (ø)
pynumaflow/_constants.py	100.00% <100.00%> (ø)
pynumaflow/sideinput/__init__.py	100.00% <100.00%> (ø)
pynumaflow/sideinput/_dtypes.py	100.00% <100.00%> (ø)

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[kohlisid]

Manual testing for SideInput using the python SDK