Refactor otelhttp.Option interface

[pellared]

More: #746

[codecov]

Codecov Report

Merging #749 (0ba6ed8) into main (e1a7c47) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main    #749   +/-   ##
=====================================
  Coverage   78.4%   78.4%           
=====================================
  Files         60      60           
  Lines       2714    2715    +1     
=====================================
+ Hits        2130    2131    +1     
  Misses       452     452           
  Partials     132     132           

Impacted Files	Coverage Δ
instrumentation/net/http/otelhttp/config.go	78.5% <100.0%> (+0.5%)	⬆️