Simplify SDK registration

[dyladan]

Which problem is this PR solving?

• Fixes Simplify initialization #823

Short description of the changes

• Add a register method to the TracerProvider which registers all configured SDK components with the API.

New register method on TracerProvider

Defaults

Propagator

Tracer Provider	Default Value
Basic	Trace Context
Node	Trace Context
Web	Trace Context

Context Manager

Tracer Provider	Default Value
Basic	Noop Scope Manager (manual context propagation)
Node	Async Hooks Scope Manager
Web	Zone Scope Manager

import { NodeTracerProvider } from '@opentelemetry/node';

const tracerProvider = new NodeTracerProvider();
tracerProvider.register();

Override Scope Manager or Propagator

import { NodeTracerProvider } from '@opentelemetry/node';
import { AsyncHooksScopeManager } from '@opentelemetry/scope-async-hooks';
import { HttpTraceContext } from '@opentelemetry/core';

const tracerProvider = new NodeTracerProvider();

tracerProvider.register({
  contextManager: new AsyncHooksScopeManager(),
  propagator: new HttpTraceContext(),
});

Use null to skip a default

import { NodeTracerProvider } from '@opentelemetry/node';

const tracerProvider = new NodeTracerProvider();

tracerProvider.register({
  propagator: null, // no propagator will be initialized
});

[codecov-io]

Codecov Report

Merging #837 into master will decrease coverage by 1.01%.
The diff coverage is 47.29%.

@@            Coverage Diff             @@
##           master     #837      +/-   ##
==========================================
- Coverage   92.63%   91.62%   -1.02%     
==========================================
  Files         251      192      -59     
  Lines       11057     7310    -3747     
  Branches     1079      646     -433     
==========================================
- Hits        10243     6698    -3545     
+ Misses        814      612     -202

Impacted Files	Coverage Δ
...ckages/opentelemetry-web/test/registration.test.ts	0% <0%> (ø)
...kages/opentelemetry-node/test/registration.test.ts	100% <100%> (ø)
...ackages/opentelemetry-web/src/WebTracerProvider.ts	100% <100%> (ø)	⬆️
...kages/opentelemetry-node/src/NodeTracerProvider.ts	100% <100%> (ø)	⬆️
...s/opentelemetry-tracing/src/BasicTracerProvider.ts	73.33% <27.27%> (-26.67%)	⬇️
...ges/opentelemetry-plugin-https/test/utils/utils.ts	33.33% <0%> (-26.67%)	⬇️
...ntelemetry-tracing/test/MultiSpanProcessor.test.ts	97.43% <0%> (-2.57%)	⬇️
...s/opentelemetry-metrics/test/MeterProvider.test.ts	100% <0%> (ø)	⬆️
packages/opentelemetry-resources/src/constants.ts	100% <0%> (ø)	⬆️
packages/opentelemetry-tracing/src/config.ts	100% <0%> (ø)	⬆️
... and 88 more

[OlivierAlbertini]

LGTM

[dyladan]

Switch to stack

[vmarchaud]

Is there any specific reason to use the stack scope manager by default ?

[dyladan]

Zone scope manager depends on zone.js which may not be available. If we have it as a dependency, then we may have a different zone.js than the end user. If we have it as a peer dependency, the scope manager would be broken for any user that doesn't have zone.js.

[dyladan]

@mayurkale22 when this looks good to you I think it is ok to merge. Just waiting on last resolution confirmation from @obecny

[mayurkale22]

lgtm, are you planning to update the examples in separate PR?

[dyladan]

The old registration method still works so I think a separate pr makes sense here