WIP: feature: add plugin system for template functions

[brainexe]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 18.42105% with 31 lines in your changes missing coverage. Please review.

Project coverage is 81.79%. Comparing base (4656216) to head (10a630a).
Report is 66 commits behind head on master.

❗ Current head 10a630a differs from pull request most recent head 1ae9145

Please upload reports for the commit 1ae9145 to get more accurate results.

Files	Patch %	Lines
bot/plugin.go	11.42%	30 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
- Coverage   82.52%   81.79%   -0.73%     
==========================================
  Files         141      129      -12     
  Lines        6460     5866     -594     
==========================================
- Hits         5331     4798     -533     
+ Misses        985      945      -40     
+ Partials      144      123      -21     

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