[Health] Remove references to deprecated v1 Android embeddings (#1021)

* Remove Google Fit and imports from Android code

* Formatting

* Remove Google Fit column from readme

* Remove support for Google Fit types not supported by Health Connect

* Remove more Google Fit workout types

* Remove references to Google Fit, remove `useHealthConnectIfAvailable`

* Remove `disconect` method channel

* Remove `flowRate` from `writeBloodOxygen` as it is not supported in Health Connect

* Remove more unsupported workout types

* Add missing import

* Remove Google Fit as dependency

* Add notice in README

* Improve logging for HC permission callback

* Update some documentation

* Android: Fix `requestAuthorization` not returning a result on success

* Remove additional workout types that are not supported

* Remove another workout type

* Add missing unimplemented method

* Remove reference to v1 Android embedding

packages/health/android/src/main/kotlin/cachet/plugins/health/HealthPlugin.kt

@@ -32,7 +32,6 @@ import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.MethodChannel.Result
 import io.flutter.plugin.common.PluginRegistry.ActivityResultListener
-import io.flutter.plugin.common.PluginRegistry.Registrar
 import java.time.*
 import java.time.temporal.ChronoUnit
 import java.util.*
@@ -119,28 +118,6 @@ class HealthPlugin(private var channel: MethodChannel? = null) :
         threadPoolExecutor = null
     }
 
-    // This static function is optional and equivalent to onAttachedToEngine. It supports the
-    // old
-    // pre-Flutter-1.12 Android projects. You are encouraged to continue supporting
-    // plugin registration via this function while apps migrate to use the new Android APIs
-    // post-flutter-1.12 via https://flutter.dev/go/android-project-migration.
-    //
-    // It is encouraged to share logic between onAttachedToEngine and registerWith to keep
-    // them functionally equivalent. Only one of onAttachedToEngine or registerWith will be
-    // called
-    // depending on the user's project. onAttachedToEngine or registerWith must both be defined
-    // in the same class.
-    companion object {
-        @Suppress("unused")
-        @JvmStatic
-        fun registerWith(registrar: Registrar) {
-            val channel = MethodChannel(registrar.messenger(), CHANNEL_NAME)
-            val plugin = HealthPlugin(channel)
-            registrar.addActivityResultListener(plugin)
-            channel.setMethodCallHandler(plugin)
-        }
-    }
-
     override fun success(p0: Any?) {
         handler?.post { mResult?.success(p0) }
     }