Readme updates

[adamsitnik]

• mention .NET 8 support
• add new packages to the list
• provide readme for HealthChecks.AzureServiceBus, describe the breaking changes and point to the new package

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5be2f55) 64.23% compared to head (63f41c2) 64.09%.
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2131      +/-   ##
==========================================
- Coverage   64.23%   64.09%   -0.14%     
==========================================
  Files         248      248              
  Lines        8396     8344      -52     
  Branches      592      586       -6     
==========================================
- Hits         5393     5348      -45     
+ Misses       2852     2846       -6     
+ Partials      151      150       -1     

Flag	Coverage Δ
AzureServiceBus	71.34% <ø> (ø)

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[adamsitnik]

The table renders properly, I am just going to merge it