fix: didx request cannot be accepted

[rmnre]

Hi everyone,

this PR fixes a few problems which were apparently introduced by #1710:

• A didx request which is received in response to an explicit oob invitation cannot be accepted because the state of the corresponding connection record is not updated to 'request-received'

• The admin api incorrectly indicates that the /out-of-band/receive-invitation endpoint returns a ConnRecord instead of the new OobRecord (which is also why the OobRecord is not included in the swagger.json)

@TimoGlastra: maybe you want to take a look to make sure I didn't break the connectionless exchange feature by saving the updated connection record?

[dbluhm]

I haven't explicitly evaluated whether this impacts connection-less exchange but not saving the conn rec in just that one case certainly seems like a bug. This fix looks reasonable to me.

[codecov-commenter]

Codecov Report

Merging #1881 (2fec3f6) into main (8e6dce2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1881   +/-   ##
=======================================
  Coverage   93.79%   93.79%           
=======================================
  Files         539      539           
  Lines       34079    34081    +2     
=======================================
+ Hits        31965    31967    +2     
  Misses       2114     2114           

[swcurran]

An integration test is failing. Hopefully this is not an intermittent failure, but it needs to be investigated.