[SPIKE] RPGF Contributor Keygen

[jurevans]

This issue is a generic task to track issues related to generating mainnet-compatible keys ahead of mainnet for contributors to receive funds in genesis.

## Our alternate ask

If dedicated binaries won’t work, then we ask that you update the existing namadaw CLI binaries. This is not our preferred method, because namadaw is made for someone who will use the CLI and the people we're onboarding likely will not use the CLI.

However, as long as we have a way to get a private key or mnemonic out of the CLI in a way that can later be used in a more conventional user interface (to access funds after the chain launches) will work for our purposes.

In this case, these are the issues that we’re seeing:

1. the CLI doesn't output a mnemonic phrase for the recipient to write down
2. the only apparent way to export the private key is by outputting to a file, which later apparently cannot be imported into the CLI
   1. we don’t know if conventional user interfaces will import this file format
3. there's apparently no way to import a private key directly into the CLI, only a mnemonic
4. keys can’t be generated in the CLI without a genesis file

Links

Github

• functions like generating keypairs won't work without a genesis file namada#1952 - Pre-genesis keygen issue
• rPGF at genesis namada#2009 - RPGF at Genesis
• [tracking] Key generation readiness namada#2002 - Key gen readiness

Etc

• Notion doc: https://www.notion.so/Heliax-request-1-keygen-binaries-05d037271f1f4cc5a7da65a931bcc78b

[jurevans]

Closing, as this is being handled by extension & airdrop website