Accept external plugins

[TaiSakuma]

No description provided.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (2476ca7) 86.64% compared to head (b71dbd9) 86.53%.

Files	Patch %	Lines
nextline/plugin/spec.py	33.33%	1 Missing and 1 partial ⚠️
tests/main/test_register.py	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   86.64%   86.53%   -0.11%     
==========================================
  Files         112      113       +1     
  Lines        4327     4352      +25     
  Branches      713      718       +5     
==========================================
+ Hits         3749     3766      +17     
- Misses        522      528       +6     
- Partials       56       58       +2     

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