Implement the Input ECP command

[MedievalApple]

I would like to implement the /input?params ECP command. This command is almost identical to the /launch/appid?params command. But instead of launching an app and passing params, the /input?params command sends these requests params to the currently running application without re-launching it.

[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.38%. Comparing base (e38b845) to head (720059b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/rokuecp/rokuecp.py	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #789      +/-   ##
==========================================
- Coverage   96.22%   95.38%   -0.84%     
==========================================
  Files           7        7              
  Lines         450      455       +5     
  Branches       76       77       +1     
==========================================
+ Hits          433      434       +1     
- Misses          4        8       +4     
  Partials       13       13              

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