test: reproduce 412 pouchdb error

[Elendiar]

This PR contains:

• TEST that reproduced a bug

Describe the problem you have without this PR

(https://github.com/pubkey/rxdb/discussions/4106)

I started test:browser with "--single-run=false --auto-watch" and checked IndexedDB in debug manually to make sure sure of different digest.

[pubkey]

RxError (DB9): RxError (DB9):
createRxDatabase(): Adapter not added. Use addPouchPlugin(require('pouchdb-adapter-[adaptername]'));
Given parameters: {
adapter:"idb"}

Please check.

Also pls try to reproduce this with a smaller attachment so that I can use that in the unit tests without add a such long base64 string.

[Elendiar]

RxError (DB9): RxError (DB9):
createRxDatabase(): Adapter not added. Use addPouchPlugin(require('pouchdb-adapter-[adaptername]'));
Given parameters: {
adapter:"idb"}

Please check.

Also pls try to reproduce this with a smaller attachment so that I can use that in the unit tests without add a such long base64 string.

Fix this and changed base64string.

[pubkey]

Thanks,
I double checked, it is not working as it should. PouchDB does not create the same hash as RxDB's md5 hashing which is used for attachments.

[pubkey]

I decided to refactor how the attachment hashing works.
In the future it should hash inside of the RxStorage, not from the outside by RxDB itself.
This will make the behavior equal to CouchDB: pouchdb/pouchdb#3156 (comment)

Branch: #4115

[pubkey]

Fixed here: #4115