feat: add r/demo/daoweb realm

[zivkovicmilos]

Description

This PR adds a simple JSON adapter for r/gov/dao/v2, used by govdao-web.

Contributors' checklist...

• x ] Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.33%. Comparing base (367408a) to head (681e163).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3074   +/-   ##
=======================================
  Coverage   63.33%   63.33%           
=======================================
  Files         548      548           
  Lines       78601    78646   +45     
=======================================
+ Hits        49780    49810   +30     
- Misses      25466    25474    +8     
- Partials     3355     3362    +7     

Flag	Coverage Δ
contribs/gnodev	61.11% <ø> (ø)
contribs/gnofaucet	14.82% <ø> (ø)
gno.land	67.18% <ø> (-0.19%)	⬇️
gnovm	67.88% <ø> (ø)
misc/genstd	79.72% <ø> (ø)
tm2	62.41% <ø> (+0.10%)	⬆️

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