Connection protocol: add encrypt_message, remove auto-problem-report sending

[Patrik-Stas]

Addition:

• Add encrypt_message on impl<I, S> Connection<I, S> where S: TheirDidDoc

Breaking change:

• For InviteeConnection<Requested> method handle_response, remove automatic problem-report sending in case of error processing connection-response message. The caller should, like in other protocols, inspect Error result returned and decide to send (or not) problem report
• Same applies for InviterConnection<Invited> method handle_request processing of connection-request.
• Remove methods defined on Connection for to dispatch problem report messages

[codecov-commenter]

Codecov Report

Merging #982 (28eb7b4) into main (ecc2047) will increase coverage by 0.05%.
Report is 1 commits behind head on main.
The diff coverage is 22.58%.

❗ Current head 28eb7b4 differs from pull request most recent head df76001. Consider uploading reports for the commit df76001 to get more accurate results

@@            Coverage Diff             @@
##             main     #982      +/-   ##
==========================================
+ Coverage   30.02%   30.08%   +0.05%     
==========================================
  Files         415      415              
  Lines       26916    26846      -70     
  Branches     5243     5233      -10     
==========================================
- Hits         8081     8076       -5     
+ Misses      16639    16574      -65     
  Partials     2196     2196              

Flag	Coverage Δ
unittests-aries-vcx	30.08% <22.58%> (+0.05%)	⬆️

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

Files	Coverage Δ
aries_vcx/src/core/profile/ledger.rs	70.58% <ø> (-0.85%)	⬇️
aries_vcx/src/handlers/proof_presentation/types.rs	43.75% <ø> (-1.15%)	⬇️
aries_vcx/tests/utils/scenarios/connection.rs	89.24% <100.00%> (ø)
aries_vcx/src/common/credentials/mod.rs	82.81% <0.00%> (ø)
...ocols/proof_presentation/verifier/state_machine.rs	49.11% <0.00%> (-0.36%)	⬇️
aries_vcx/src/protocols/connection/invitee/mod.rs	78.94% <60.00%> (+8.85%)	⬆️
aries_vcx/src/protocols/connection/inviter/mod.rs	75.00% <33.33%> (+7.74%)	⬆️
aries_vcx/src/utils/devsetup.rs	42.20% <0.00%> (+0.16%)	⬆️
aries_vcx/src/protocols/connection/generic/mod.rs	9.16% <0.00%> (+0.20%)	⬆️
aries_vcx/src/protocols/connection/mod.rs	7.89% <0.00%> (+3.72%)	⬆️

... and 2 files with indirect coverage changes

[gmulhearn]

lgtm