feat(templating): add support for 'tags' array

[JosephKav]

e.g.
tags: ['alpha', 'bravo']

template	result
{{ tags | first }}	alpha
{{ tags.0 }}	alpha
{{ tags | slice:'1:2' | first }}	bravo
{{ tags | last }}	bravo
{{ tags.1 }}	bravo
{{ tags | join:',' }}	alpha,bravo
{{ tags.2 }}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.82%. Comparing base (dc5acb2) to head (7c68590).
⚠️ Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #700      +/-   ##
==========================================
+ Coverage   98.82%   98.82%   +0.01%     
==========================================
  Files         132      132              
  Lines        8892     8894       +2     
==========================================
+ Hits         8787     8789       +2     
  Misses         80       80              
  Partials       25       25              

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