Add logs and metrics to default features in api, sdk and otlp crate

[cijothomas]

Fixes #1709
All 3 signals are planned to reach beta in the next release. This PR is changing the default for api,sdk,otlp crates to include all three signals by default. The separate feature flags are still maintained, so if anyone wants to only pick only, it is still possible.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.1%. Comparing base (29ac005) to head (2fde1b2).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1783   +/-   ##
=====================================
  Coverage   74.1%   74.1%           
=====================================
  Files        125     125           
  Lines      19484   19484           
=====================================
+ Hits       14451   14453    +2     
+ Misses      5033    5031    -2     

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

[lalitb]

Thanks. Good to check if we need to add this for opentelemetry-proto too.

[cijothomas]

Thanks. Good to check if we need to add this for opentelemetry-proto too.

I left that as it is not clear why would end users need that directly...