[New Library] AndroidX WorkManager extensions

[EdricChan03]

AndroidX WorkManager currently does have a KTX module, but it doesn't provide a lot of utilities :/

API suggestions

• WorkInfo methods which return a Flow instead of LiveData (note: 2.9.0-alpha01 already offers such a feature, so we should provide a backwards-compatible Kotlin extension that emulates the 2.9.0-alpha01 methods on <=2.8.0)

• [WorkManager] Better Kotlin DSL for Data #4

  val workData = buildData {
    // Perhaps we can have similar utilities to that of a MutableMap?
    this += "key" to 123
    this += workDataOf(/* ... */) // Add existing data
    addData {
      // Add data from a Data.Builder
      putBoolean("abc", false)
    }
  
    this -= workDataOf(/* ... */) // Remove the mutable data's properties that are present in the specified Data
  }

• Add suspend methods for methods that return a LiveData

• Add worker request methods that accept a java.time.Duration/kotlin.time.Duration instead of a Long + TimeUnit

• Add top-level methods to create anonymous objects of interfaces (for e.g. RunnableScheduler)