Add AndroidTarget as KMP target

Right now, we get the following error when using `androidTarget` on a KMP project:

```
Execution failed for task ':webgpu-ktypes-descriptors:compileDebugKotlinAndroid'.
> Error while evaluating property 'friendPathsSet$kotlin_gradle_plugin_common' of task ':webgpu-ktypes-descriptors:compileDebugKotlinAndroid'.
> Could not resolve all files for configuration ':webgpu-ktypes-descriptors:debugCompileClasspath'.
> Could not resolve org.jetbrains:annotations:26.0.2.
```