Allow '/' character in instrument names

[aabmass]

Fixes #4500

[MrAlias]

Can you add a changelog entry for this please?

[codecov]

Codecov Report

Merging #4501 (936a8c4) into main (ac4fca2) will decrease coverage by 0.1%.
Report is 1 commits behind head on main.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #4501     +/-   ##
=======================================
- Coverage   81.3%   81.3%   -0.1%     
=======================================
  Files        220     220             
  Lines      17670   17670             
=======================================
- Hits       14378   14376      -2     
- Misses      2992    2994      +2     
  Partials     300     300             

Files Changed	Coverage
exporters/otlp/otlpmetric/version.go	100.0%
exporters/otlp/otlptrace/version.go	100.0%
sdk/metric/meter.go	100.0%
sdk/metric/version.go	100.0%
sdk/version.go	100.0%
version.go	100.0%

[aabmass]

Can you add a changelog entry for this please?

Done