Add template support to compose widget

[ericnewcomer]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.01863% with 37 lines in your changes missing coverage. Please review.

Project coverage is 78.67%. Comparing base (1e26863) to head (fc4ac4b).

Files	Patch %	Lines
src/compose/Compose.ts	78.35%	21 Missing ⚠️
src/templates/TemplateEditor.ts	71.69%	15 Missing ⚠️
src/tabpane/TabPane.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #440      +/-   ##
==========================================
- Coverage   78.73%   78.67%   -0.06%     
==========================================
  Files          84       84              
  Lines       21826    21924      +98     
  Branches      728      740      +12     
==========================================
+ Hits        17184    17249      +65     
- Misses       4631     4664      +33     
  Partials       11       11              

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