Allow redaction of other metric fields in stdoutmetric exporter

[bvwells]

Allow redaction of other metric fields in stdoutmetric exporter.

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 84.5%. Comparing base (1f76264) to head (dceca58).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #5233     +/-   ##
=======================================
- Coverage   84.5%   84.5%   -0.1%     
=======================================
  Files        258     258             
  Lines      17096   17101      +5     
=======================================
  Hits       14452   14452             
- Misses      2345    2350      +5     
  Partials     299     299             

Files	Coverage Δ
exporters/stdout/stdoutmetric/exporter.go	94.1% <100.0%> (ø)
exporters/stdout/stdoutmetric/config.go	83.6% <16.6%> (-9.6%)	⬇️

[bvwells]

Extension of what was added in #3223. If concept looks okay, I will clean up and add tests, etc.