Contacts and clean up

[pfeairheller]

This PR includes:

• Client side code to list contacts from KERIA
• Removal of old and out of date integration directory.

[codecov]

Codecov Report

Merging #83 (4ad9f77) into development (cf16893) will decrease coverage by 0.05%.
The diff coverage is 84.61%.

@@               Coverage Diff               @@
##           development      #83      +/-   ##
===============================================
- Coverage        88.15%   88.10%   -0.05%     
===============================================
  Files               15       16       +1     
  Lines              979      992      +13     
===============================================
+ Hits               863      874      +11     
- Misses             116      118       +2     

Files	Coverage Δ
src/signify/app/contacting.py	100.00% <100.00%> (ø)
src/signify/app/clienting.py	96.78% <33.33%> (-0.89%)	⬇️

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