Rethink Type and NamedType + rewrite specta_typescript

[oscartbeaumont]

This PR is an exploration into rethinking the core Specta interface with the goal of supporting specta-jsonschema converting schemars::Schema -> specta::DataType.

TODO:

• variants.dedup();
• Inlining
• Flatten
• Docs
• Fix test suite
• Finish todos in Typescript exporter
• Fix field_flattened
• Drop jsdoc and legacy modules from Typescript
• Typescript detect_duplicate_type_names hooked back up
• Dynamic specta id’s
• Drop DataTypeFrom
• Tauri Specta and rspc working on this new stuff

Future:

• NamedDataType whats the plan? Rename NamedType trait???
• Rethink to_named??
• Flatten NamedDataTypeExt onto NamedDataType?
• TypeCollection::flatten_stack is it still needed?
• Remove datatype::inline module. It's not a Specta feature?
• Can DataType::Generic be a special Reference instead?
• Maybe we should move docs and deprecated from NamedDataType to StructType/EnumType. Would help Mattrax & struct fields also hold docs so... - Would prevent documenting/deprecating a primtive type though so idk.
• static_types.rs into specta_typescript
• Remove DataType::Any, DataType::Unknown, etc.