added additional tests for yb.core.chat

[gkspranger]

• added a new gitignore for .clj-kondo -- appears when adding said vscode extension
• yetibot.core.chat
  • exposed validate-sender function so i can test it
• yetibot.core.test.chat
  • expanded on tests for should-send-msg-for-each?, mainly asserting the negative
  • added tests for validate-sender, a little funky since said function returns a function, so really just testing the returned function

i am bored and wanted to exercise these muscles a little

[codecov[bot]]

Codecov Report

Merging #205 (ebfe5f9) into master (a1d2609) will increase coverage by 0.26%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
+ Coverage   58.85%   59.11%   +0.26%     
==========================================
  Files          95       95              
  Lines        4168     4168              
  Branches      234      233       -1     
==========================================
+ Hits         2453     2464      +11     
+ Misses       1481     1471      -10     
+ Partials      234      233       -1     

Impacted Files	Coverage Δ
src/yetibot/core/chat.clj	55.29% <100.00%> (+12.94%)	:arrow_up:

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