Pull request #36: MCA-3182 InAppChatInputView customizations improvement

Merge in MML/infobip-mobile-messaging-android.wiki from jdzubak-MCA-3182-customizations-improvement to master

Squashed commit of the following:

commit 74e2a970d1e1a9984d8fad9b75a2265d07a62356
Author: Jakub Dzubak <[email protected]>
Date:   Mon Sep 11 16:50:49 2023 +0200

    MCA-3182 InAppChatInputView customizations improvement

commit cd64500e0e9bdb53f47ec9ef2dbc33307d189a00
Author: Jakub Dzubak <[email protected]>
Date:   Fri Sep 8 10:20:14 2023 +0200

    MCA-3182 InAppChatInputView customizations improvement

In‐app-chat.md

@@ -145,24 +145,26 @@ To customize the In-app chat you have to define your own custom theme. There are
 ```
 2. In code, you can pass `InAppChatTheme` to `InAppChat.setTheme()`, which provides same customization as the xml approach.
 ```kotlin
-InAppChat.getInstance(context).setTheme(InAppChatTheme(
-  InAppChatToolbarStyle(), //chat toolbar
-  InAppChatToolbarStyle(), //attachment toolbar
-  InAppChatStyle(),
-  InAppChatInputViewStyle()
-  )
+InAppChat.getInstance(context).setTheme(
+    InAppChatTheme(
+        InAppChatToolbarStyle(), //chat toolbar
+        InAppChatToolbarStyle(), //attachment toolbar
+        InAppChatStyle(),
+        InAppChatInputViewStyle()
+    )
 )
 ```
 <details><summary>expand to see Java code</summary>
 <p>
 
 ```java
-InAppChat.getInstance(context).setTheme(new InAppChatTheme(
-  new InAppChatToolbarStyle(), //chat toolbar
-  new InAppChatToolbarStyle(), //attachment toolbar
-  new InAppChatStyle(),
-  new InAppChatInputViewStyle()
-  )
+InAppChat.getInstance(context).setTheme(
+    new InAppChatTheme(
+        new InAppChatToolbarStyle(), //chat toolbar
+        new InAppChatToolbarStyle(), //attachment toolbar
+        new InAppChatStyle(),
+        new InAppChatInputViewStyle()
+    )
 );
 ```
 
@@ -224,8 +226,12 @@ Theme attribute `ibChatInputStyle` supports the following chat input style attri
     <item name="ibChatInputBackgroundColor">@android:color/white</item>
     <item name="ibChatInputHintText">Your custom hint</item>
     <item name="ibChatInputHintTextColor">@android:color/darker_gray</item>
+    <item name="ibChatInputAttachmentBackgroundColor">@android:color/white</item>
+    <item name="ibChatInputAttachmentBackgroundDrawable">@null</item>
     <item name="ibChatInputAttachmentIcon">@null</item>
     <item name="ibChatInputAttachmentIconTint">@android:color/black</item>
+    <item name="ibChatInputSendBackgroundColor">@android:color/white</item>
+    <item name="ibChatInputSendBackgroundDrawable">@null</item>
     <item name="ibChatInputSendIcon">@null</item>
     <item name="ibChatInputSendIconTint">@android:color/black</item>
     <item name="ibChatInputSeparatorLineColor">@android:color/darker_gray</item>