autoexport: Add @pellared as codeowner

[pellared]

I have been doing most of the changes recently:

• autoexport: OTLP exporter defaults to http/protobuf protocol instead of grpc #4100
• autoexport: Handle OTEL_TRACES_EXPORTER=none #4130
• autoexport: Update docs #4132
• autoexport: Rename IsNone to IsNoneSpanExporter #4134

I also created some issues as part of maintaining this module. One is still open: #4131

[codecov]

Codecov Report

Merging #4165 (1f4d134) into main (7d9626d) will decrease coverage by 0.1%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #4165     +/-   ##
=======================================
- Coverage   79.4%   79.3%   -0.1%     
=======================================
  Files        166     166             
  Lines      10360   10360             
=======================================
- Hits        8230    8224      -6     
- Misses      1996    2000      +4     
- Partials     134     136      +2     

see 2 files with indirect coverage changes