Fix clippy lints

Fix clippy lints

Rename traits

Remove `Value::Optional*` variants; Drop `ReactiveValue`; Add `ReactiveField`

Remove deprecated items

Remove obsolete code

Flatten crates

Move derive-crudkit-id into crudkit-core-macros; Move utils to crudkit-core-macro-util

Consolidate crudkit-core crates

Refactor crudkit-web derive macros to be located in single crudkit-web-macros crate

Relocate crates

Add section on refactoring

Create shared ValueKind abstraction for code-gen in crudkit-derive-core

Support additional ID field types

Move crudkit-leptos-theme into the already existing crudkit-leptos workspace