[feature] #2774, #2775: `kagami` genesis improvments

[Erigara]

Description of the Change

• Generate key for every Account;
• Extend synthetic genesis with default domain (wonderland) and account (alice) to be able to perform query;
• Make genesis generation mode subcommand instead of flag.

Issue

Closes #2774, #2775.

Benefits

Improved UX and generation.

Possible Drawbacks

None.

Usage Examples or Tests [optional]

Generation of default genesis left unchanged:

cargo run --bin kagami -- genesis

Generation of synthetic genesis:

cargo run --bin kagami -- genesis synthetic --domians 100 --accounts-per-domain 10 --assets-per-domain 10