PoC for Encryptor Signature Self-Delegation Authentication

[cygnusv]

Type of PR:

• Bugfix
• Feature
• Documentation
• Other

Required reviews:

• 1
• 2
• 3

What this does:

High-level idea of the changes introduced in this PR. List relevant API
changes (if any), as well as related PRs and issues.

Issues fixed/closed:

• Fixes #...

Why it's needed:

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if this PR address a nucypher/productdev issue, let reviewers know!

Notes for reviewers:

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of your PR that requires more attention from reviewers?

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (epic-v0.6.x@8a7e72d). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff               @@
##             epic-v0.6.x     #601   +/-   ##
==============================================
  Coverage               ?   89.30%           
==============================================
  Files                  ?       74           
  Lines                  ?     6565           
  Branches               ?      178           
==============================================
  Hits                   ?     5863           
  Misses                 ?      702           
  Partials               ?        0           

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