Hooks simplification

[bkolad]

Description

This PR introduces the following changes:

1. The TxHooks has been split into two separate hooks: ApplyBlobTxHooks and ApplyBlobSequencerHooks. These hooks now belong to the sov-modules-api and are implemented in sov-accounts and sov-sequencer-registry. Consequently, the DempAppHook structure has been removed.
2. The TxVerifier has been removed, and the stateless verification has been implemented in sov-default-stf. This verification only performs a signature check, and it makes sense to share it.

These two changes have simplified the AppTemplate since it no longer requires the aforementioned structures as parameters.

3. The AppTemplate requires that Runtime implements ApplyBlobTxHooks and ApplyBlobSequencerHooks (the implementation is trivial).

Now ApplyBlobTxHooks implementation for Runtime has a well-defined structure and could be implemented as a macro, but it should be done in a separate PR.

Linked Issues

• Fixes Create Default Tx Hooks and Default Tx Verifier #319
• Related to Auto-generate hooks based on Runtime #320

Testing

All relevant tests are updated.

Docs

Relevant readmes updated (the biggest change in demo-stf)