FastAPI integration, docs, api ref

[chainyo]

This PR:

• Fix typing error
• Adds a large part of the package usage to the documentation
• Fix package imports
• Re-work FastAPI integration tools
• Adds API reference to docs

[codecov-commenter]

Codecov Report

Merging #29 (26306e4) into main (c915bdc) will increase coverage by 0.32%.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   98.54%   98.87%   +0.32%     
==========================================
  Files          12       13       +1     
  Lines         206      266      +60     
==========================================
+ Hits          203      263      +60     
  Misses          3        3              

Files Changed	Coverage Δ
src/tensorshare/__init__.py	100.00% <ø> (ø)
src/tensorshare/utils.py	100.00% <ø> (ø)
src/tensorshare/client.py	100.00% <100.00%> (ø)
src/tensorshare/schema.py	100.00% <100.00%> (ø)
src/tensorshare/server.py	100.00% <100.00%> (ø)