FEAT: add emit_schematic and emitter_node classes

[jsalant22]

emit_schematic class makes it easier for users to add/connect components

emitter_node provides access to an Emitter's radio/antenna

also cleaned up some code

Description

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Issue linked

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Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[codecov]

Codecov Report

❌ Patch coverage is 85.14851% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.35%. Comparing base (0e281d2) to head (aa0e66a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6639      +/-   ##
==========================================
+ Coverage   82.33%   82.35%   +0.01%     
==========================================
  Files         242      243       +1     
  Lines       76847    76913      +66     
==========================================
+ Hits        63275    63341      +66     
  Misses      13572    13572              

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