chore: sampler gets a full context

[dyladan]

Fixes #1630

[codecov]

Codecov Report

Merging #1631 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1631      +/-   ##
==========================================
+ Coverage   91.19%   91.22%   +0.02%     
==========================================
  Files          69      165      +96     
  Lines        1784     5070    +3286     
  Branches      375     1039     +664     
==========================================
+ Hits         1627     4625    +2998     
- Misses        157      445     +288     

Impacted Files	Coverage Δ
packages/opentelemetry-tracing/src/Tracer.ts	98.33% <ø> (ø)
...metry-core/src/trace/sampler/ParentBasedSampler.ts	83.87% <100.00%> (+0.53%)	⬆️
...core/src/trace/sampler/TraceIdRatioBasedSampler.ts	100.00% <100.00%> (ø)
...ry-exporter-prometheus/src/PrometheusSerializer.ts	97.84% <0.00%> (ø)
packages/opentelemetry-metrics/src/Metric.ts	97.22% <0.00%> (ø)
packages/opentelemetry-resources/src/Resource.ts	100.00% <0.00%> (ø)
...emetry-core/src/platform/node/RandomIdGenerator.ts	87.50% <0.00%> (ø)
packages/opentelemetry-plugin-http/src/utils.ts	97.36% <0.00%> (ø)
...s/opentelemetry-metrics/src/BatchObserverMetric.ts	93.10% <0.00%> (ø)
...telemetry-plugin-grpc-js/src/server/patchServer.ts	88.52% <0.00%> (ø)
... and 94 more