Add HIP-904 Frictionless Airdrops design

[edwin-greene]

Description:

Add the design doc for HIP-904 Friction-less Airdrops

Related issue(s):

Fixes #8082

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.44%. Comparing base (2b6f271) to head (5a454cb).
Report is 85 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8127      +/-   ##
============================================
+ Coverage     92.24%   92.44%   +0.20%     
+ Complexity     7282     7181     -101     
============================================
  Files           901      881      -20     
  Lines         29284    29089     -195     
  Branches       3572     3560      -12     
============================================
- Hits          27012    26891     -121     
+ Misses         1451     1383      -68     
+ Partials        821      815       -6     

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[Nana-EC]

Looking good.
Some suggestions for consideration and clarity.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[steven-sheehy]

LGTM

[xin-hedera]

LGTM

[Nana-EC]

LG