remove `export * from ...` usage in `sdk-node` package

[trentm]

See #4186 where we worked through remove all other export * from ... usage in published packages. These in the sdk-node package are the last remaining ones:

opentelemetry-js/experimental/packages/opentelemetry-sdk-node/src/index.ts

Lines 20 to 27 in e7865c6

	export * as api from '@opentelemetry/api';
	export * as contextBase from '@opentelemetry/api';
	export * as core from '@opentelemetry/core';
	export * as logs from '@opentelemetry/sdk-logs';
	export * as metrics from '@opentelemetry/sdk-metrics';
	export * as node from '@opentelemetry/sdk-trace-node';
	export * as resources from '@opentelemetry/resources';
	export * as tracing from '@opentelemetry/sdk-trace-base';

The original motivations for remove export * usage:

• to not inadvertently made public and become part of the public API
• to not be a blocker for using tslib (see Named esm import fails on v1.15.0 #3976 (comment))

Some discussion specifically about the export * in the sdk-node package start here: #4186 (comment)

Does anyone use these re-exports?

Some anecdotal data on how common it is that these re-exports are used from the sdk-node package.

The contrib repo has three cases of using these re-exports:

metapackages/auto-instrumentations-node/src/register.ts
16:import * as opentelemetry from '@opentelemetry/sdk-node';

packages/baggage-span-processor/README.md
33:import { NodeSDK, tracing } from '@opentelemetry/sdk-node';

packages/opentelemetry-test-utils/src/test-fixtures.ts
27:import { NodeSDK, tracing } from '@opentelemetry/sdk-node';

The first one (in auto-instrumentations-node) will be removed as part of #5443 and open-telemetry/opentelemetry-js-contrib#2708).

I acknowledge the convenience of using the tracing re-export to get common classes like tracing.SimpleSpanProcessor and tracing.ConsoleSpanExporter.

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An unscientific read through results from https://github.com/search?q=%22from+'%2540opentelemetry%252Fsdk-node'%22 suggests that somewhere around 10% of hits for import { ... } from '@opentelemetry/sdk-node' are using one of these re-exports.