Add support for the development attributes advisory parameter

[dashpole]

From the spec:

Instrument advisory parameter: Attributes

Status: Development

Applies to all instrument types.

Attributes (a list of attribute keys) is
the recommended set of attribute keys to be used for the resulting metrics.

We already have WithAttributes options, so i've opted to name this WithDefaultAttributes to avoid naming collisions. We could also consider WithAttributeKeys, or WithDefaultAttributeKeys

Follows the pattern for experimental options introduced in #8111

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.3%. Comparing base (56cd7ab) to head (2fb77b1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
metric/x/options.go	0.0%	5 Missing ⚠️
sdk/metric/meter.go	97.6%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #8135     +/-   ##
=======================================
- Coverage   82.3%   82.3%   -0.1%     
=======================================
  Files        309     310      +1     
  Lines      24238   24255     +17     
=======================================
+ Hits       19963   19975     +12     
- Misses      3898    3903      +5     
  Partials     377     377             

Files with missing lines	Coverage Δ
sdk/metric/pipeline.go	90.3% <100.0%> (+<0.1%)	⬆️
sdk/metric/meter.go	92.3% <97.6%> (+0.2%)	⬆️
metric/x/options.go	0.0% <0.0%> (ø)

... and 2 files with indirect coverage changes

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