feat: class based refactor for SDK

[kohlisid]

Fixes #106 1) Refactor the SDKs to accept both classes and function as handlers 2) Seperated common server utilities 3) Abstracted server start call to have common function for all server types, do not need to use aiorun seperately for async functions. Makes it easier to switch between them for the UDF owner. 4) Different server classes for each UDF 5) Enable UV loop for async execution

[codecov[bot]]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (a6957c2) 95.21% compared to head (59d6550) 95.15%.

Files	Patch %	Lines
pynumaflow/sourcer/_dtypes.py	70.58%	5 Missing :warning:
pynumaflow/reducer/async_server.py	88.00%	2 Missing and 1 partial :warning:
pynumaflow/_constants.py	88.23%	1 Missing and 1 partial :warning:
pynumaflow/mapper/sync_server.py	87.50%	2 Missing :warning:
pynumaflow/mapstreamer/_dtypes.py	80.00%	2 Missing :warning:
pynumaflow/mapstreamer/servicer/async_servicer.py	90.90%	0 Missing and 2 partials :warning:
pynumaflow/sideinput/server.py	84.61%	2 Missing :warning:
pynumaflow/sourcer/server.py	81.81%	2 Missing :warning:
pynumaflow/sourcer/servicer/async_servicer.py	96.96%	0 Missing and 2 partials :warning:
pynumaflow/mapper/_dtypes.py	91.66%	1 Missing :warning:
... and 14 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #129 +/- ## ========================================== - Coverage 95.21% 95.15% -0.07% ========================================== Files 33 45 +12 Lines 1359 1424 +65 Branches 89 81 -8 ========================================== + Hits 1294 1355 +61 - Misses 36 50 +14 + Partials 29 19 -10 ```

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