refactor: OpenTracingPropagator -> OTTracePropagator rename

[mwear]

Which problem is this PR solving?

This PR renames the OpenTracingPropagator to OTTracePropagator as per this spec issue: open-telemetry/opentelemetry-specification#1391, specifically this comment: open-telemetry/opentelemetry-specification#1391 (comment). As discussed in the issue, there was not a single context propagation format specified in OpenTracing, but there were several that gained some adoption. The OT trace format was adopted by Lightstep and was also used by the "basic tracer" implementations in OpenTracing.

Short description of the changes

• Renames the OpenTracingPropagator to OTTracePropagator
• Renames the package from opentelemetry-propagator-opentracing to opentelemetry-propagator-ot-trace

[codecov]

Codecov Report

Merging #329 (3987085) into main (d59bd00) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #329   +/-   ##
=======================================
  Coverage   95.48%   95.48%           
=======================================
  Files         119      119           
  Lines        6273     6273           
  Branches      609      609           
=======================================
  Hits         5990     5990           
  Misses        283      283           

Impacted Files	Coverage Δ
...ors/opentelemetry-propagator-ot-trace/.eslintrc.js	0.00% <ø> (ø)
...s/opentelemetry-propagator-ot-trace/src/version.ts	0.00% <ø> (ø)
...metry-propagator-ot-trace/src/OTTracePropagator.ts	95.83% <100.00%> (ø)
...propagator-ot-trace/test/OTTracePropagator.test.ts	100.00% <100.00%> (ø)