Type Updates and add onScroll event handler

[NoodleOfDeath]

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used patch-package to patch [email protected] for the project I'm working on.

Here is the diff that solved my problem:

diff --git a/node_modules/react-native-gifted-chat/lib/GiftedChat.d.ts b/node_modules/react-native-gifted-chat/lib/GiftedChat.d.ts
index eb9b7de..d4e10bb 100644
--- a/node_modules/react-native-gifted-chat/lib/GiftedChat.d.ts
+++ b/node_modules/react-native-gifted-chat/lib/GiftedChat.d.ts
@@ -20,7 +20,7 @@ import { Send, SendProps } from './Send';
 import { SystemMessage, SystemMessageProps } from './SystemMessage';
 import { Time, TimeProps } from './Time';
 import * as utils from './utils';
-export interface GiftedChatProps<TMessage extends IMessage = IMessage> {
+export interface GiftedChatProps<TMessage extends IMessage = IMessage> extends Partial<MessageContainer<TMessage>> {
     messageContainerRef?: React.RefObject<FlatList<IMessage>>;
     textInputRef?: React.RefObject<TextInput>;
     messages?: TMessage[];
diff --git a/node_modules/react-native-gifted-chat/lib/MessageContainer.js b/node_modules/react-native-gifted-chat/lib/MessageContainer.js
index b577850..6394e04 100644
--- a/node_modules/react-native-gifted-chat/lib/MessageContainer.js
+++ b/node_modules/react-native-gifted-chat/lib/MessageContainer.js
@@ -55,6 +55,8 @@ class MessageContainer extends React.PureComponent {
             hasScrolled: false,
         };
         this.renderTypingIndicator = () => {
+            if (this.props.renderTypingIndicator)
+                return this.props.renderTypingIndicator();
             return <TypingIndicator isTyping={this.props.isTyping || false}/>;
         };
         this.renderFooter = () => {
@@ -81,6 +83,8 @@ class MessageContainer extends React.PureComponent {
                 this.props.forwardRef.current.scrollToEnd({ animated });
         };
         this.handleOnScroll = (event) => {
+            if (this.props.handleOnScroll)
+              this.props.handleOnScroll(event);
             const { nativeEvent: { contentOffset: { y: contentOffsetY }, contentSize: { height: contentSizeHeight }, layoutMeasurement: { height: layoutMeasurementHeight }, }, } = event;
             const { scrollToBottomOffset } = this.props;
             if (this.props.inverted)

This issue body was partially generated by patch-package.