feat: possibility to set theme in PaperProvider (#5)

Author: souhe

src/Paper__PaperProvider.re

@@ -1,2 +1,5 @@
 [@bs.module "react-native-paper"] [@react.component]
-external make: (~children: React.element) => React.element = "Provider";
+external make:
+  (~children: React.element, ~theme: Paper__ThemeProvider.Theme.t=?) =>
+  React.element =
+  "Provider";

src/Paper__ThemeProvider.re

@@ -48,19 +48,29 @@ module Theme = {
       (~regular: font, ~medium: font, ~light: font, ~thin: font) => t;
   };
 
+  module Animation = {
+    type t;
+
+    [@bs.obj] external make: (~scale: float) => t;
+
+    [@bs.get] external scale: t => float = "scale";
+  };
+
   [@bs.obj]
   external make:
     (
       ~roundness: int=?,
       ~dark: bool=?,
       ~colors: Colors.t=?,
       ~fonts: Fonts.configured=?,
+      ~animation: Animation.t=?,
       unit
     ) =>
     t;
 
   [@bs.get] external fonts: t => Fonts.configured = "fonts";
   [@bs.get] external colors: t => Colors.t = "colors";
+  [@bs.get] external animation: t => Animation.t = "animation";
   [@bs.get] external dark: t => bool = "dark";
 };