Refactor sending Aries messages

[Patrik-Stas]

• 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 #250 (6523946) into breaking/proof-request-message (605e3d4) will decrease coverage by 0.01%.
The diff coverage is 48.14%.

@@                        Coverage Diff                         @@
##           breaking/proof-request-message     #250      +/-   ##
==================================================================
- Coverage                           57.90%   57.89%   -0.02%     
==================================================================
  Files                                 149      149              
  Lines                               19708    19715       +7     
  Branches                             4418     4421       +3     
==================================================================
+ Hits                                11412    11414       +2     
- Misses                               4967     4972       +5     
  Partials                             3329     3329              

Flag	Coverage Δ
integration	26.51% <18.51%> (+<0.01%)	⬆️
unittests	52.11% <48.14%> (-0.01%)	⬇️

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> (+0.46%)	⬆️
...es/handlers/connection/invitee/states/requested.rs	55.55% <0.00%> (ø)
...ries/handlers/connection/inviter/states/invited.rs	54.16% <0.00%> (ø)
libvcx/src/aries/handlers/connection/util.rs	37.50% <0.00%> (ø)
libvcx/src/aries/messages/connection/did_doc.rs	77.20% <25.00%> (-1.98%)	⬇️
...aries/handlers/connection/inviter/state_machine.rs	70.37% <50.00%> (ø)
...aries/handlers/connection/invitee/state_machine.rs	71.93% <66.66%> (+0.34%)	⬆️
libvcx/src/aries/handlers/connection/connection.rs	53.72% <100.00%> (ø)
...ies/handlers/connection/invitee/states/complete.rs	86.00% <100.00%> (ø)
...ies/handlers/connection/inviter/states/complete.rs	86.00% <100.00%> (ø)

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