[Fix typescript] Add title alignment to OptionsTopBarTitle (#4341)

Add title alignment to options

docs/docs/styling.md

@@ -235,7 +235,8 @@ Navigation.mergeOptions(this.props.componentId, {
     elevation: 1.5, // TopBar elevation in dp
     topMargin: 24, // top margin in dp
     title: {
-      height: 70 // TitleBar height in dp
+      height: 70, // TitleBar height in dp
+      alignment: 'center', // Center title
     }
   },
   bottomTabs: {

lib/src/interfaces/Options.ts

@@ -141,6 +141,11 @@ export interface OptionsTopBarTitle {
    * #### (Android specific)
    */
   height?: number;
+  /**
+   * Title alignment
+   * #### (Android specific)
+   */
+  alignment?: 'center' | 'fill';
 }
 
 export interface OptionsTopBarSubtitle {