Merge #1370

1370: feat(interface-types) Crate reorganization r=Hywan a=Hywan

This PR re-organizes the crate:

* `interpreter/wasm/values.rs` moves to `values.rs`,
* `interpreter/wasm/serde/*` moves to `serde/*`,
* `types.rs` is new, and includes `InterfaceType` and `RecordType`,
* Update the documentation.

Bonus: `InterfaceValue::Record`  now takes a `Vec1` rather than a `Vec` to match `InterfaceType::Record`.

Co-authored-by: Ivan Enderlin <ivan@mnt.io>

src/encoders/binary.rs

@@ -1,6 +1,6 @@
 //! Writes the AST into bytes representing WIT with its binary format.
 
-use crate::{ast::*, interpreter::Instruction};
+use crate::{ast::*, interpreter::Instruction, types::*};
 use std::io::{self, Write};
 
 /// A trait for converting a value to bytes.