Add slack module from lvm-api

[albireox]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.53846% with 12 lines in your changes missing coverage. Please review.

Project coverage is 90.2%. Comparing base (9cebf08) to head (2fa572a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lvmopstools/slack.py	81.6%	6 Missing and 6 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #11     +/-   ##
=======================================
- Coverage   91.0%   90.2%   -0.8%     
=======================================
  Files         11      12      +1     
  Lines        698     763     +65     
  Branches      91     104     +13     
=======================================
+ Hits         635     688     +53     
- Misses        27      33      +6     
- Partials      36      42      +6     

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