Added name parameter to start_span() and deprecated description parameter.

[antonpirker]

To align our API with OpenTelementry. In OTel a span has no description but a name.

This only changes to user facing API, under the hood there is still everything using the description. (This will then be changed with OTel)

Docs PR: getsentry/sentry-docs#11332

Follow up PR that should be released at the same time: #3525

Fixes #3520

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.28%. Comparing base (a581542) to head (5401ed2).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3524      +/-   ##
==========================================
+ Coverage   84.25%   84.28%   +0.02%     
==========================================
  Files         136      136              
  Lines       13895    13900       +5     
  Branches     2938     2940       +2     
==========================================
+ Hits        11707    11715       +8     
+ Misses       1458     1456       -2     
+ Partials      730      729       -1     

Files with missing lines	Coverage Δ
sentry_sdk/scope.py	88.04% <100.00%> (+0.05%)	⬆️
sentry_sdk/tracing.py	85.11% <100.00%> (+0.06%)	⬆️

... and 2 files with indirect coverage changes