fix(telegram): escape special characters in message text for Markdown…

[samanhappy]

This PR includes changes to ensure that special characters in the message text are properly escaped for Telegram's Markdown format. Since the underscore is currently specific to Telegram, the modification is made within Telegram and not in the higher-level calls.

Resolve #628

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.37%. Comparing base (eef3a25) to head (243c2e8).
Report is 107 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #629      +/-   ##
==========================================
- Coverage   98.80%   89.37%   -9.44%     
==========================================
  Files          85       93       +8     
  Lines        5867     6550     +683     
==========================================
+ Hits         5797     5854      +57     
- Misses         51      667     +616     
- Partials       19       29      +10     

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