Prevent escaping slash of URL

[humdrum]

What this PR does / why we need it:

• To prevent escaping shahs of URL.
  • eg. (http://abc.def -> http:\/\/abc.def)
  • apply "withoutEscapingSlashes" option when encoding dictionaries to JSON
• I also made changes to the TCs.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation:

Checklist:

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (4a63cca) 43.02% compared to head (2b0b1ad) 43.02%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #127   +/-   ##
=======================================
  Coverage   43.02%   43.02%           
=======================================
  Files         104      104           
  Lines       22932    22932           
=======================================
  Hits         9866     9866           
  Misses      13066    13066           

Files	Coverage Δ
Sources/Document/CRDT/CRDTText.swift	88.99% <100.00%> (ø)
Sources/Util/Dictionary+Extension.swift	31.32% <0.00%> (ø)
Tests/Integration/TextIntegrationTests.swift	0.00% <0.00%> (ø)

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[myupage]

Thank you.