App codegen module organization

[krisbitney]

App codegen currently puts all generate types in a single file, even when multiple wraps were imported.

Example: https://github.com/polywrap/wrap-abi-bindgen/blob/main/implementations/app-typescript/src/__tests__/cases/000-sanity/output/types.ts

We can reduce users' cognitive load by organizing the generated types into modules, making it easier for them to browse the wrap directory and understand what was generated.

Each imported wrap should have its own named directory. Each Module class should be in its own file, with a separate file for the types.

Current:

 wrap/
└── types.ts

Proposed:

wrap/
├── ethers/
│   ├── module.ts
│   └── types.ts
└── safe/
    ├── module.ts
    └── types.ts