AssetHub Forking

## Issue summary

- The basic requirement of this epic is to implement the functionality to fork assethub to anvil polkadot using lazy loading.
- Lazy loading is implemented in #64, and the integration of this work with the forking logic represents the work in this epic.
- There are two remaining components to this epic. 1) Implement assethub forking support to anvil-polkadot 2) Inject the necessary post-fork state needed to be useful for testing if needed.

To summarize the work represented by this epic:
- [ ] Implement Assethub forking support in anvil polkadot
- [ ] Configure the state post fork to be useful for testing
- [ ] Integrate the forking solution with our lazy loading backend

The deliverable of this epic should be an MVP for forking assethub for anvil-polkadot. Additional features and functionality will be added after the completion of this epic.