Notify svdx that a message has been received by wallet

Create HTTP endpoint where the wallet can notify SVDX service, that a message has been received. The message will be removed from the SVDX storage and the delivery will be considered completed.

The endpoint will be public without any authentication, because it won't be needed. Message identifiers will be 256-bit random opaque hex-encoded strings, which will be known only by the message recipient and the SVDX service.

Example request:

POST /v1/message/read
{
   "messageId": "deadbeef"
}