public DID as URL

[lainio]

• not used args removed
• readability with assert and try.Out
• refactor CreateInvitation for internal use too, outside gRPC
• implement http endpoint to get dynamic-invitation
• error case test for pub DID url
• use GET query for pub DID case
• fix that memory DB runs answer /ready endpoint
• query params renamed, refactored

[codecov]

Codecov Report

Attention: Patch coverage is 47.61905% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 76.47%. Comparing base (51232ee) to head (bc5e086).

Files	Patch %	Lines
server/server.go	46.66%	15 Missing and 1 partial ⚠️
cmd/pool.go	0.00%	5 Missing ⚠️
cmd/agency.go	33.33%	4 Missing ⚠️
cmd/key.go	0.00%	3 Missing ⚠️
cmd/export.go	0.00%	2 Missing ⚠️
cmd/import.go	0.00%	2 Missing ⚠️
protocol/notification/problem_report.go	0.00%	2 Missing ⚠️
cmd/completion.go	0.00%	1 Missing ⚠️
cmd/ledger.go	0.00%	1 Missing ⚠️
cmd/steward.go	66.66%	1 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #515      +/-   ##
==========================================
- Coverage   76.48%   76.47%   -0.01%     
==========================================
  Files         130      130              
  Lines        7573     7601      +28     
==========================================
+ Hits         5792     5813      +21     
- Misses       1585     1593       +8     
+ Partials      196      195       -1     

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