Refactor/sending messages

[Patrik-Stas]

Recreated PR #250 so we can rather merge it into master for sake of release changelog clarity.

• Remove logic around sending Aries message from AgentInfo. Instead move this logic as part of DidDoc implementation.
• Don't use httpclient of agency to send Aries messages. This causes some duplication, but otherwise causes dependency of DDO on Agency which is odd. We could later perhaps have some shared "commons" crate.

Signed-off-by: Patrik Stas patrik.stas@absa.africa

[codecov-io]

Codecov Report

Merging #255 (7c2d7d4) into master (85f6808) will decrease coverage by 5.82%.
The diff coverage is 28.81%.

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
- Coverage   57.91%   52.09%   -5.83%     
==========================================
  Files         149      148       -1     
  Lines       19766    18776     -990     
  Branches     4435     4283     -152     
==========================================
- Hits        11448     9781    -1667     
- Misses       4973     5952     +979     
+ Partials     3345     3043     -302     

Flag	Coverage Δ
integration	?
unittests	52.09% <28.81%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
libvcx/src/aries/handlers/connection/agent_info.rs	57.60% <ø> (+0.87%)	⬆️
...es/handlers/connection/invitee/states/requested.rs	40.74% <0.00%> (-14.82%)	⬇️
...ries/handlers/connection/inviter/states/invited.rs	54.16% <0.00%> (ø)
libvcx/src/aries/handlers/connection/util.rs	37.50% <0.00%> (ø)
...ibvcx/src/aries/handlers/issuance/holder/holder.rs	56.00% <ø> (+4.57%)	⬆️
...aries/handlers/proof_presentation/prover/prover.rs	60.63% <ø> (-14.37%)	⬇️
...essages/proof_presentation/presentation_request.rs	75.00% <ø> (-4.17%)	⬇️
libvcx/src/connection.rs	60.81% <ø> (-1.00%)	⬇️
libvcx/src/disclosed_proof.rs	65.50% <0.00%> (-1.83%)	⬇️
libvcx/src/credential.rs	49.81% <6.66%> (-2.16%)	⬇️
... and 48 more

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