fix: export outOfContext and storage

[CatsMiaow]

Export the relevant object so that can reuse nestjs-pino in non-http environments.
Need to reuse outOfContext to keep the options set in LoggerModule.forRoot(options).

import { outOfContext, storage as loggerStorage, Store as LoggerStore } from 'nestjs-pino';
import type { Logger as PinoLogger } from 'pino';

...

@On({ event: 'something' })
public async webSocketEvent(): Promise<void> {
  const store = new LoggerStore((<PinoLogger>outOfContext).child({
    foo: 'bar',
    user: 'test',
  }));

  await loggerStorage.run(store, async () => {
    // logic...
    this.logger.log('hello'); // {"foo":"bar","user":"test","msg":"hello" ... }
  });
}

This is not a solution to this issue(#803), but it can be used as a temporary measure.

[iamolegga]

I would prefer better developer experience instead of exporting internals. Now we will export it, after we should deprecate it and release new major version with better solution. Moreover there are no docs and tests for such usage.

Sorry, but I cannot merge it in the current state.