Move plugin components from template_mixin.py to components.py

[kecnry]

Even though we use a giant template_mixin.py file in jdaviz, these plugin re-usable components make more sense to be with their vue files and called components.

This should be rebased on main once #77 is merged.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (a4eaea7) 95.04% compared to head (33d8262) 94.47%.
Report is 3 commits behind head on main.

❗ Current head 33d8262 differs from pull request most recent head 38fd81f. Consider uploading reports for the commit 38fd81f to get more accurate results

Files	Patch %	Lines
lcviz/components/components.py	92.30%	5 Missing ⚠️
lcviz/plugins/flatten/flatten.py	81.48%	5 Missing ⚠️
lcviz/tools.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   95.04%   94.47%   -0.57%     
==========================================
  Files          32       35       +3     
  Lines        1393     1539     +146     
==========================================
+ Hits         1324     1454     +130     
- Misses         69       85      +16     

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