Multi Instance Support

[alisomay]

• Adds multi instance support and removes the global support.
• Refactors and simplifies atom handling and add unit tests.
• Improve documentations
• Uses the latest libpd-sys
• Adapt the whole code base to the multi instance support.

Resolves

• multi instance support #20

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 80.16000% with 124 lines in your changes missing coverage. Please review.

Project coverage is 87.66%. Comparing base (86e58d1) to head (0c2321b).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib.rs	69.46%	51 Missing ⚠️
src/instance.rs	50.00%	37 Missing ⚠️
src/atom.rs	88.19%	19 Missing ⚠️
src/functions.rs	86.74%	11 Missing ⚠️
src/types.rs	60.00%	4 Missing ⚠️
src/functions/send.rs	88.23%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
- Coverage   94.02%   87.66%   -6.36%     
==========================================
  Files          34       36       +2     
  Lines        1388     1727     +339     
==========================================
+ Hits         1305     1514     +209     
- Misses         83      213     +130     

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