feat: add adena wallet in-app faucet account

[adr-sk]

Adena Wallet will add an In-App Faucet in the following version, which requires a dedicated faucet account.

The Faucet will support 2 of the official Gno.land Testnets.

Details of the feature including our policies, the user flow, and a UI preview can be found here: [New Feature] In-app Faucet #454

Contributors' checklist...

• 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
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.49%. Comparing base (7596f42) to head (771ef63).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1808      +/-   ##
==========================================
+ Coverage   44.79%   47.49%   +2.69%     
==========================================
  Files         459      388      -71     
  Lines       67642    61310    -6332     
==========================================
- Hits        30300    29117    -1183     
+ Misses      34808    29755    -5053     
+ Partials     2534     2438      -96     

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[zivkovicmilos]

@adr-sk

I've created an issue on this topic, and we'll migrate the address from this balances file into a portal loop balance sheet in the future:
#1857