chore: add cli commands to craft genesis file

[albttx]

following @moul 's work on #1050

To prepare the future multi-node testnet, we'll need in gnoland cli more subcommands

• gnoland init to only init and setup genesis.json
• gnoland genesis add-account to add an account
• gnoland genesis add-txs to add transactions in genesis
• gnoland genesis gentx to add validator gentx
• gnoland genesis collect-gentxs to get the gentx
• gnoland genesis validate to validate the genesis

The current gnoland start is good for single node and dev / testnets environment, but for production, we'll need some improvement.
I even propose to rename gnoland start into gnoland dev,

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.

[thehowl]

Superseded by #1203 and related work