Use correct prefix on created @type on aries messages.

[Patrik-Stas]

Addressing issue #188

Previously Aries messages created by aries-vcx used did:sov:BzCbsNYhMrjHiqZDTUASHg;spec/ prefix for @type attribute.
According to https://github.com/hyperledger/aries-rfcs/blob/08653f21a489bf4717b54e4d7fd2d0bdfe6b4d1a/concepts/0020-message-types/README.md#aries-core-message-namespace the prefix for core aries protocols should be https://didcomm.org/

https://didcomm.org/ is used to namespace protocols defined by the community as "core protocols" or protocols that agents should minimally support.

This PR updates aries-vcx to create messages with the correct prefix.

The support for legacy prefix did:sov:BzCbsNYhMrjHiqZDTUASHg;spec/ is preserved so this PR is not breaking change, however it can be expected the support for this prefix will be removed in future releases.

This PR also adds tests for serialization/deserialization of aries messages in general.

Signed-off-by: Patrik Stas [email protected]

[codecov-commenter]

Codecov Report

Merging #341 (581911b) into main (6cec727) will decrease coverage by 2.84%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #341      +/-   ##
==========================================
- Coverage   49.68%   46.84%   -2.85%     
==========================================
  Files         158      102      -56     
  Lines       16857     8044    -8813     
  Branches     3756     2007    -1749     
==========================================
- Hits         8376     3768    -4608     
+ Misses       5847     2894    -2953     
+ Partials     2634     1382    -1252     

Flag	Coverage Δ
integration	?
unittests	46.84% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aries_vcx/src/messages/a2a/message_family.rs	0.00% <ø> (-75.39%)	⬇️
aries_vcx/src/messages/a2a/mod.rs	100.00% <ø> (+45.85%)	⬆️
aries_vcx/src/messages/a2a/message_type.rs	100.00% <100.00%> (+15.62%)	⬆️
aries_vcx/src/messages/ack.rs	0.00% <0.00%> (-62.97%)	⬇️
aries_vcx/src/messages/connection/invite.rs	0.00% <0.00%> (-58.54%)	⬇️
aries_vcx/src/messages/connection/response.rs	0.00% <0.00%> (-56.89%)	⬇️
...src/handlers/connection/inviter/states/complete.rs	0.00% <0.00%> (-56.67%)	⬇️
aries_vcx/src/messages/connection/request.rs	0.00% <0.00%> (-56.42%)	⬇️
...ation/verifier/states/presentation_request_sent.rs	0.00% <0.00%> (-54.84%)	⬇️
.../src/handlers/connection/inviter/states/invited.rs	0.00% <0.00%> (-53.85%)	⬇️
... and 111 more

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