feat(realtime): Add _type on returned doc by the handlers

in the document returned by the realtime, there is no _type
associated with the doctype, which requires some gymnastics
on the app side when the realtime is connected to different
doctypes.

Thanks to this improvement, it is enough to analyze the document
to know to which doctype it is associated.

It is in the case where the same callback is connected on different
subscribes, we do not discriminate upstream but downstream
via the doc.

The other reason is also to standardize compared to the return
of CC which normalizes the doc and adds this _type.

packages/cozy-realtime/src/CozyRealtime.js

@@ -456,7 +456,7 @@ class CozyRealtime {
     )
     for (const handler of handlers) {
       try {
-        handler(payload.doc)
+        handler({ ...payload.doc, _type: payload.type })
       } catch (e) {
         logger.error(
           `handler did throw for ${event}, ${payload.type}, ${payload.id}`

packages/cozy-realtime/src/CozyRealtime.legacy.spec.js

@@ -64,7 +64,7 @@ describe('CozyRealtime', () => {
 
   const type = 'io.cozy.bank.accounts'
   const id = 'doc_id'
-  const fakeDoc = { _id: id, title: 'title1' }
+  const fakeDoc = { _id: id, title: 'title1', _type: type }
 
   describe('subscribe', () => {
     it('should launch handler when document is created', async done => {

packages/cozy-realtime/src/CozyRealtime.spec.js

@@ -21,7 +21,7 @@ const doctype = 'io.cozy.files'
 const type = doctype
 const id = 'my-document-id'
 const message = { message: 'hello' }
-const doc = message
+const doc = { ...message, _type: type }
 const event = 'UPDATED'
 const payload = { type, doc, id }