Add inline projections to In Memory event store

[oskardudycz]

Here's the recommended outline:

1. Add inline projection setup to InMemoryEventStore options

That can be done in a similar way as in the PostgreSQL event store options.

Something like:

export type InMemoryReadEventMetadata = ReadEventMetadataWithGlobalPosition;

export type InMemoryProjectionHandlerContext = {
  eventStore: InMemoryEventStore
};

export type InMemoryEventStoreOptions = DefaultEventStoreOptions<InMemoryEventStore> & {
  projections?: ProjectionRegistration<
    'inline',
    InMemoryReadEventMetadata,
    InMemoryProjectionHandlerContext
  >[];
};

Then, cache them in a similar fashion as Postgres projections.

• DONE IN: In memory inline projections - Add inMemoryDatabase #186

2. Add InMemoryDatabase

You can clone this one for now: https://github.com/oskardudycz/EventSourcing.NodeJS/blob/main/workshops/introduction_to_event_sourcing/src/11_projections_single_stream/tools/database.ts.

Replace JSON.parse and JSON.stringify with Emmett JSONParser

• DONE IN: In memory inline projections - Add inMemoryDatabase #186

3. Port handle method to InMemoryDatabase based on Pongo one

It's placed here, should be copy/paste with small adjustments: https://github.com/event-driven-io/Pongo/blob/1a7e6f56454de6f25fa1e58aacf66b3044a434d0/src/packages/pongo/src/core/collection/pongoCollection.ts#L338.

4. Add similar projections like in Pongo

See them: https://github.com/event-driven-io/emmett/blob/52a3ba72359c4ae2de1a041c7dac3d74f77f0a63/src/packages/emmett-postgresql/src/eventStore/projections/pongo/projections.ts

And writeup about them: https://event-driven.io/en/emmett_projections_testing/

Notes

Each can be a dedicated PR.

[oskardudycz]

@stepaniukm, how does that sound to you?