mock-consensus: 🪙 `auto_app_state` assigns delegation tokens

[cratelyn]

in #3902, we discussed that auto_app_state should:

1. Generate a list of penumbra validator definitions corresponding to the consensus keys specified in the builder. There must be at least one.

2. Inject those validator definitions into the provided AppState

3. Create allocations of delegation tokens for each validator, controlled by some address. Otherwise the validator won't have any voting power and will be immediately deleted.

we should address point (3), so that the validator is not immediately deleted.

• #3588