Adds an Attribute assertion to metric data test

[MadVikingGod]

This is an attempt to solve the immediate problem of #3435.

It creates a new Assert function that will check if the attributes on ALL DataPoints contain the Attributes provided.

[codecov]

Codecov Report

Merging #3487 (6774d23) into main (d7b3115) will increase coverage by 0.1%.
The diff coverage is 95.0%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #3487     +/-   ##
=======================================
+ Coverage   77.9%   78.0%   +0.1%     
=======================================
  Files        165     165             
  Lines      11634   11755    +121     
=======================================
+ Hits        9066    9179    +113     
- Misses      2372    2380      +8     
  Partials     196     196             

Impacted Files	Coverage Δ
sdk/metric/metricdata/metricdatatest/assertion.go	80.6% <89.1%> (+5.2%)	⬆️
...dk/metric/metricdata/metricdatatest/comparisons.go	97.5% <97.6%> (+<0.1%)	⬆️
exporters/jaeger/jaeger.go	90.3% <0.0%> (-0.9%)	⬇️