feat: new almanac and name service registration flow

[Alejandro-Morales]

No description provided.

[jrriehl]

I updated this PR with a few things:

1. Almanac registration is now performed before startup tasks. This means that actions performed on_event("startup") can now assume that registration has already taken place. This will help to prevent errors when returning messages are undeliverable.

2. Name service registration example now uses a simple CosmPy owner wallet to illustrate the fact that domain name owners need not be and will generally not be the agents themselves.

3. All of the contract interactions are moved to uagents.network.

[lrahmani]

LGTM, just a minor inline comment