feat: foreach construct

[erdos]

Implements #125

[codecov]

Codecov Report

Merging #129 (33cd7a4) into master (944d2d7) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 33cd7a4 differs from pull request most recent head c0dc6bc. Consider uploading reports for the commit c0dc6bc to get more accurate results

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   93.04%   93.06%   +0.02%     
==========================================
  Files          25       25              
  Lines        1897     1904       +7     
  Branches      108      108              
==========================================
+ Hits         1765     1772       +7     
  Misses         24       24              
  Partials      108      108              

Impacted Files	Coverage Δ
src/stencil/eval.clj	100.00% <100.00%> (ø)
src/stencil/tokenizer.clj	96.82% <100.00%> (+0.10%)	⬆️

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