Rename provider builders

[cijothomas]

Fixes #2560
Technically breaking, but practically no impact for most. All examples/usages continue to work as-is.

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.8%. Comparing base (bd0ee84) to head (24d156c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-sdk/src/trace/provider.rs	83.3%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2562   +/-   ##
=====================================
  Coverage   77.8%   77.8%           
=====================================
  Files        122     122           
  Lines      23059   23059           
=====================================
  Hits       17956   17956           
  Misses      5103    5103           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.