Add funcs to semconv to create semantic convention KeyValues

[MrAlias]

Currently the semconv packages provide attribute keys users can use to build key-values from, but the key-value type is also a part of the semantic convention. Instead of requiring a user to get this type correct, provide creation functions for each semantic convention that is not explicitly restricted to be an enum.

Changes

• Update the semconv template to generate creation functions for semconv keys that are not explicitly defined as enums
• Clean documentation
  • Wrap > 79 characters
  • Do not split on hyphens or long words
  • Follow Go documentation guidelines by starting with the object name
• Re-generate v1.17.0 with new generation template

[codecov]

Codecov Report

Merging #3675 (b7a4621) into main (d3986ef) will decrease coverage by 0.1%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3675     +/-   ##
=======================================
- Coverage   79.7%   79.7%   -0.1%     
=======================================
  Files        171     171             
  Lines      12673   12673             
=======================================
- Hits       10103   10101      -2     
- Misses      2357    2359      +2     
  Partials     213     213             

Impacted Files	Coverage Δ
sdk/trace/batch_span_processor.go	80.2% <0.0%> (-0.9%)	⬇️