Make document and message encryptable

[trema96]

Add encryption to Document and Message apis. For all methods with Document/Message inputs or outputs:

• the base api implementation is overriden in the x api with a method that throws an exception (returns never)
• a new xWithUser method that encrypts inputs and decrypts outputs is added. The methods take as input a user to align with the existing implementations, but this user can be undefined as it is not actually used.

Other changes:

• Changes to existing decrypt method on Document
  • Removed unused parameter hcpartyId
  • Changed return type
  • Embedded attachment (encryptedAttachment / decryptedAttachment) is not handled automatically anymore. If needed we can add a decryptEmbeddedAttachment
• Removed message-in-topic methods
• Removed encrypted / decrypted message methods not following the xWithUser convention (replaced by the corresponding xWithUser method)
• Removed DocumentXApi.findByMessage (replaced by findIdsByMessage)
• Fixes and changes to PatientXApi.export method:
  • Remove using post parameter
  • Stop using deprecated get by patient id method, replaced by get ids by patient ids + batch retrieve
  • Fix return type
  • Return coherent entities: everything is decrypted if possible, stop using stubs.