Encoding / Decoding revamp

[arboleya]

The Sway compiler is going through a long-discussed revamp of its encoder/decoder scheme, eventually leading to an intermediary representation that both the SDK and the compiler will target.

This will act as a topic issue to encompass everything necessary:

Must have:

• Support new encode/decode for __log #1671
• New encoding for Contracts #1739
• New encoding for Scripts and Predicates #1749

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Issues from other repos:

• Specs: Encoding version 1 documentation fuel-specs#541
• Sway: Serialization and encoding/decoding sway#4769
• Rust SDK: Encoder/decoder revamp  fuels-rs#1246

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Desirable items will be addressed as follow-ups:

• Support heap types (Vector, Bytes, StdString) return from scripts #1187
• Support configurable constants with v1 encoding #2041
• Introduce config driven coding and reduce touch points - Refactor the ABI Coder package #1795
• Functional rewrite for abi-coder - Refactor the ABI Coder package #1795
• Merge the forc-project directories - Merge forc-projects-experimental with forc-projects in fuel-gauge #2005

[digorithm]

@arboleya, What's the status on this? Can we close this issue now? I've closed the equivalent epic on the rust SDK side even though there are some missing things due to blockers on the compiler side (RawSlice and string slices); we're making those follow-up work since most of the new encoder/decoder support is done.

[arboleya]

Yes, we can. The desired items can be follow-ups.