test(telegram): add generator test

[piksel]

adds simple simulation of user interaction with telegram generator as a test

[codecov]

Codecov Report

Merging #190 (2c112a9) into main (265789c) will increase coverage by 2.61%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   64.18%   66.79%   +2.61%     
==========================================
  Files          87       87              
  Lines        2770     2774       +4     
==========================================
+ Hits         1778     1853      +75     
+ Misses        840      760      -80     
- Partials      152      161       +9     

Impacted Files	Coverage Δ
pkg/services/telegram/telegram_json.go	83.33% <ø> (+16.66%)	⬆️
pkg/services/telegram/telegram_generator.go	74.64% <33.33%> (+74.64%)	⬆️
pkg/services/telegram/telegram_config.go	100.00% <0.00%> (+39.13%)	⬆️
pkg/services/telegram/telegram_client.go	72.00% <0.00%> (+44.00%)	⬆️

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[piksel]

This is so stupid. The only added non-test code is the ability to replace the default I/O with testable ones. So the "regular" non-test code is obviously not being hit by tests...