Update flow of enabling generator

[shuse2]

Description

Currently we handle generator keys in the config file under generations.generator, and it is decrypted using an endpoint.
We also allow to setup multiple generator in a node.

We need to have keys for both ed25519 and BLS, we need to consider if we should or how we should change the key management for validator.

Motivation

• Support ed25519 and BLS key from different passphrases
• Simplify and make key management consistent
• Not storing passphrase in the config
• Support setting up multiple validators for testing
• Use RPC endpoint more consistently over config

Tasks

• Update module endpoint context to have access to module.db #7312
• Add new generator endpoints #7313
• Add new random module endpoints #7314
• Create keys commands #7315
• Create generator commands #7316
• Create endpoint command #7317
• Remove generator config and use generator db data #7318
• Update commander init to support new generator flow #7319