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[bot]]

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 :warning:
cmd/pool.go	0.00%	5 Missing :warning:
cmd/agency.go	33.33%	4 Missing :warning:
cmd/key.go	0.00%	3 Missing :warning:
cmd/export.go	0.00%	2 Missing :warning:
cmd/import.go	0.00%	2 Missing :warning:
protocol/notification/problem_report.go	0.00%	2 Missing :warning:
cmd/completion.go	0.00%	1 Missing :warning:
cmd/ledger.go	0.00%	1 Missing :warning:
cmd/steward.go	66.66%	1 Missing :warning:
... and 7 more

Additional details and impacted files

```diff @@ 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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