chore!: merge fuels-types and fuels-core

[hal3e]

closes: #945

fuels-types is merged into fuels-core. This is the new structure:

fuels-core
├── Cargo.toml
└── src
    ├── codec
    │   ├── abi_decoder.rs
    │   ├── abi_encoder.rs
    │   └── function_selector.rs
    ├── codec.rs
    ├── lib.rs
    ├── traits
    │   ├── parameterize.rs
    │   └── tokenizable.rs
    ├── traits.rs
    ├── types
    │   ├── bech32.rs
    │   ├── core
    │   │   ├── bits.rs
    │   │   ├── bytes.rs
    │   │   ├── native.rs
    │   │   ├── raw_slice.rs
    │   │   └── sized_ascii_string.rs
    │   ├── core.rs
    │   ├── enum_variants.rs
    │   ├── errors.rs
    │   ├── param_types.rs
    │   ├── transaction_builders.rs
    │   ├── unresolved_bytes.rs
    │   ├── wrappers
    │   │   ├── block.rs
    │   │   ├── chain_info.rs
    │   │   ├── coin.rs
    │   │   ├── input.rs
    │   │   ├── message_proof.rs
    │   │   ├── message.rs
    │   │   ├── node_info.rs
    │   │   ├── resource.rs
    │   │   ├── transaction_response.rs
    │   │   └── transaction.rs
    │   └── wrappers.rs
    ├── types.rs
    ├── utils
    │   ├── constants.rs
    │   └── offsets.rs
    └── utils.rs

• modules utils and types::core and types::wrappers are not exposed. They are used for code organization.
• traits are moved to fuels-core - breaking!
• codec is now used to get to ABIEncoder, ABIDecoder, try_from_bytes and resolve_fn_selector - breaking!
• exposed fuels_core::types only through fuels::types

Checklist

• I have linked to any relevant issues.
• I have updated the documentation.
• I have added necessary labels.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[iqdecay]

Haven't reviewed yet, but I suggest we hold off on this PR until #950 is merged because it's more pressing than this tech debt. I should push the corrections to the PR today.

[segfault-magnet]

Reviewed, seems good.

Waiting for the fuels types reexports to remove redundancy in the import path.

IIRC we agreed that was to be done here. If not ping me and I'll approve.

[segfault-magnet]

Looks good.

I'd give up on the idea of shortening the reexport path since even the std does it like we do (e.g. std::result::Result)

[Salka1988]

👍

[iqdecay]

nice reorg, feels much cleaner now 🧹

Please make sure to include precise instructions on how to migrate the exports for the user, and include it in a BREAKING CHANGE footer!

[digorithm]

Wonderful — ship it!