Public API for Deps plugin

[stepango]

Deps plugin would be distributed standalone to accelerate adoption.

Deps API working just fine in Forma Android plugin but integration directly with Gradle configuration is not so simple.

1. We need to design an API

2. Make sure we coven all existing use-cases in Gradle configuration

API #️⃣1:

plugins {
  ...
}
// var Project.dependencies
dependencies = deps(
  androidx.navigation,
  androidx.livedata
  ...
)

Pros:
looks similar to Forma Android

Cons:
override conflict with Gradle API's(try inline?)
only supports implementation configuration

Improvements:
Change the name to avoid conflicts
Use configurations in name e.g. implementationDependencies = deps(...), testImplementationDependencies = deps(...)

API #️⃣2

// operator fun DependencyHandler.plus(...)
dependencies + deps(
  androidx.navigation,
  androidx.livedata
)

// OR

dependencies {
  + deps(...)
}

Pros:
looks similar to Forma Android

Cons:
only supports implementation configuration

Improvements:
Use configurations name in dependencies block:

dependencies {
  implementation + deps(...)
  api + deps(...)
}