plugin(grpc): use HttpTextFormat instead of Binary propagator

[mayurkale22]

Which problem is this PR solving?

• This is inline with Remove binary format propagator opentelemetry-specification#426

• This is not compatible with OpenCensus, I have added onHold label, waiting for #opentelemetry-specification/426 to merge.

• Will open follow-up PR to remove Binary propagator completely.

• Feel free to add reviews

/cc @markwolff @dyladan

[dyladan]

@mayurkale22 the linked spec issue is merged now

[mayurkale22]

@mayurkale22 the linked spec issue is merged now

Removed the onHold label, will create separate PR to remove BinaryFormat class.

[dyladan]

I'm going to approve this for now, but we should be using the new setter interface for propagators to handle this. https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/api-propagators.md#setter-argument

[dyladan]

Bummer that this will be broken/incompatible if you call an older version of ourselves now, but I suppose it had to be done

[codecov-io]

Codecov Report

Merging #762 into master will decrease coverage by 22.13%.
The diff coverage is 66.66%.

@@             Coverage Diff             @@
##           master     #762       +/-   ##
===========================================
- Coverage   92.99%   70.86%   -22.14%     
===========================================
  Files         244       89      -155     
  Lines       10861     2313     -8548     
  Branches     1058      317      -741     
===========================================
- Hits        10100     1639     -8461     
+ Misses        761      674       -87

Impacted Files	Coverage Δ
...metry-core/src/trace/sampler/ProbabilitySampler.ts	94.11% <66.66%> (-5.89%)	⬇️
...try-core/test/trace/fixtures/test-package/index.js	0% <0%> (-100%)	⬇️
...pentelemetry-core/src/platform/node/performance.ts	0% <0%> (-100%)	⬇️
...st/trace/fixtures/test-package/foo/bar/internal.js	0% <0%> (-100%)	⬇️
...telemetry-core/test/platform/hex-to-base64.test.ts	0% <0%> (-100%)	⬇️
...ry-api/test/noop-implementations/noop-span.test.ts	0% <0%> (-100%)	⬇️
...-api/test/noop-implementations/noop-tracer.test.ts	0% <0%> (-100%)	⬇️
...ntelemetry-core/src/platform/node/hex-to-base64.ts	0% <0%> (-88.89%)	⬇️
...ckages/opentelemetry-core/test/platform/id.test.ts	0% <0%> (-77.78%)	⬇️
...entelemetry-core/test/common/ConsoleLogger.test.ts	0% <0%> (-77.02%)	⬇️
... and 229 more