chore: sync DFSP backend api with sdk adapter

[kleyow]

I'm going to rename the misnomer of "inbound" with "backend" in another PR.

Pay attention mostly to sdk-scheme-adapter/v2_0_0/inbound/openapi.yaml

To bring api-snippets and sdk-scheme-adapter in sync I had to sort the yaml for easier comparsion, leading to huge diff.

The backend openapi in api snippets was a proper snapshot of the Backend Api before the bulk work was started.
I'm not sure how the backend openapi's that we used in the TTK's got desynced with the backend openapi that was living there before bulk.

Mainly changes to this openapi definition was

• Added the newly added bulk endpoints.
• Fix sub id url param
• Add in missing components found in TTK spec that we're using for bulk functional tests
• Add operation Id's which are useful for DFSP's

Main things I found here and not in sdk-scheme-adapter.

• Existence of get /transfers that existed here but not in the sdk
• Some ilppacket work here but not in the sdk
• Differing fulfilNotification component that sdk. I believe the one here is the correct and latest one.

[mdebarros]

if we are changing the title, shouldn't the file name also match?

[mdebarros]

+1

renaming file was address in this PR: #150