Rename Commands* -> Command*

Summary:
The names of events and props flow type annotations are singular. The names of the commands flow types are however plural. This diff renames all "Commands*" flow types to be singular.

**Motivation:** Consistency

Changelog: [Internal]

Reviewed By: yungsters

Differential Revision: D24708276

fbshipit-source-id: 5d5d2123426ca1139953169d0ea764b82b2f3809

packages/react-native-codegen/src/generators/components/GeneratePropsJavaInterface.js

@@ -12,7 +12,7 @@
 
 import type {
   NamedShape,
-  CommandsTypeAnnotation,
+  CommandTypeAnnotation,
   ComponentShape,
   PropTypeAnnotation,
   SchemaType,
@@ -157,7 +157,7 @@ function getCommandArgJavaType(param) {
 }
 
 function getCommandArguments(
-  command: NamedShape<CommandsTypeAnnotation>,
+  command: NamedShape<CommandTypeAnnotation>,
   componentName: string,
 ): string {
   return [