add ApiService; fix bug on reconnection

[pieroit]

I tried to follow these instructions:

pass the api client instance to the services when initializing them inside the stores. do not import globally like this

Problems

• I ended up having a store which was mostly overlapped with the settings store. So maybe that store should be updated to be the central one and it should also deal with apiClient callbacks (which are now set in messages store).
• I was managing the apiClient as a composable, but then I had to get that composable in every store, and pass that manually to each service
• All the services had to be reworked to accept the apiClient as input
• It was more code, less clear, harder to understand.

Solution

• There is now a ApiService, imported directly from other services. So MemoryService just imports the apiClient (as it is now)
• the ApiService contains apiClient, which is initialized in App.vue with the jwt.

Notes

• fixed double apiClient instancing, that was causing this:
• now it only connects once
• fixed the reconnection bug:
  • more retries (please note they are cumulative, retries is not reset on reconnection and I don't know how to do it)
  • home view textarea is reactivated on ws connection (it remained deactivated because the error flag was not reset)

[zAlweNy26]

Much better, after these changes I think we can merge, thanks for the help!