Added support for yaml files and other updates

[iguinn]

• Added support for yaml files using "safe_load"
• Made it possible to set coord_grid directly rather than setting period and offset separately
• The signature and types in kwargs can now be included either through kwargs or as their own json/yaml entries (I may deprecate kwargs at some point)
• module entry is now unnecessary; instead you can prepend the module to the function name (i.e. dspeed.processors.trap)
• Fixed a bug that was causing unit conversions to mess up for time coordinates when reading them as outputs
• Added tests

[codecov]

Codecov Report

Attention: Patch coverage is 62.16216% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 62.83%. Comparing base (293ef8c) to head (f904711).
Report is 4 commits behind head on main.

Files	Patch %	Lines
src/dspeed/processing_chain.py	64.70%	12 Missing ⚠️
src/dspeed/build_dsp.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
- Coverage   63.05%   62.83%   -0.22%     
==========================================
  Files          46       46              
  Lines        2980     2995      +15     
==========================================
+ Hits         1879     1882       +3     
- Misses       1101     1113      +12     

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