This reverts commit a1864e3c.
We will actually make the balance delta messages part of the tycho packages since this makes a few things simpler when trying to factor out an sdk.
- `lib.rs` split into multiple files with `modules.rs` being the main entrypoint for substreams
- contract changes are tracked similiarly to ambient (generalized to use a store of tracked contracts)
- static attributes were pruned of the dynamic ones
