How to describe dependencies on local packages with relative path

Hello developers,

I'm trying to understand Component Model with cargo-component. To that end I have tried to create a simple example, but I have the following error and would like to discuss it if you allow me to do it here.

```shell
$ cargo component build --release
error: failed to create a target world for package `comp2` (/workspaces/wasm-component-example/comp2/Cargo.toml)

Caused by:
0: failed to decode component dependency `newgyu:comp1`
1: dependency is not a WebAssembly component
```

cargo-component version is here.
```shell
$ cargo component --version
cargo-component-component 0.1.0 (6af088a 2023-08-16 wasi:2750b73)
```

## My example and what I expect
https://github.com/NewGyu/wasm-component-example


There are two packages, then each package has a world.
- `newgyu:comp1/random-generator`
- `rand` func is exported.
- `newgyu:comp2/hello`
- `hello-world` func is exported, and that depends on `rand` func that is provided by `newgyu:comp1`.

### Directory structures

```shell
$ tree -L 2.
.
├── comp1
│ ├── Cargo.toml
│ ├── src
│ │ └── lib.rs
│ └── wit
│ └── world.wit
├── comp2
│ ├── Cargo.toml
│ ├── src
│ │ └── lib.rs
│ └── wit
│ └── world.wit
```

### Code

#### comp2
`comp2` is specifying a dependency on `comp1` as local package reference.

```toml
[package]
name = "comp2"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
cargo-component-bindings = { git = "https://github.com/bytecodealliance/cargo-component" }

[lib]
crate-type = ["cdylib"]

[package.metadata.component]
package = "newgyu:comp2"

[package.metadata.component.target]
path = "wit"

[package.metadata.component.dependencies]
"newgyu:comp1" = { path = "../comp1/wit/world.wit" }
```

#### comp1
`comp1` could be built with `cargo component build --release`. The followings have been built.
* target/bindings/comp1/target.wasm
* target/bindings/comp1/world
* target/wasm32-wasi/release/comp1.wasm

```toml
[package]
name = "comp1"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
cargo-component-bindings = { git = "https://github.com/bytecodealliance/cargo-component" }

[lib]
crate-type = ["cdylib"]

[package.metadata.component]
package = "newgyu:comp1"

[package.metadata.component.target]
path = "wit"
world = "random-generator"

[package.metadata.component.dependencies]

```

## Points I would like to ask about

- Is it correct tow to describe dependencies on local packages with relative path ?
- Is the dependency type handled as `Wit` when described as above ?
- Why does `into_component_world` respond error?
- Should I explicitly specify `Wasm` as the dependency type? How to specify that in Cargo.toml?

https://github.com/bytecodealliance/cargo-component/blob/3f36696db9c39785886b0766b2b81f83cbc3d29e/crates/core/src/registry.rs#L394-L402