Convert files in themes/ services/ contexts/ to TS

Convert all Javascript files in `client/src/themes`, `client/src/service`, `client/src/contexts` to Typescript.
Convert SvgIcon, Input, ConversationView, Button components to Typescript

Gitlab #30

Change-Id: I0d0505c28e21c771906edf8d5e7b8ce36126fa64
diff --git a/client/src/components/ConversationListItem.js b/client/src/components/ConversationListItem.js
index 40057b3..5338503 100644
--- a/client/src/components/ConversationListItem.js
+++ b/client/src/components/ConversationListItem.js
@@ -9,8 +9,8 @@
 import { useAppDispatch } from '../../redux/hooks';
 import authManager from '../AuthManager';
 import ConversationAvatar from './ConversationAvatar';
-import { RemoveContactIcon, VideoCallIcon } from './svgIcons';
-import { AudioCallIcon, BlockContactIcon, ContactDetailsIcon, CrossIcon, MessageIcon } from './svgIcons';
+import { RemoveContactIcon, VideoCallIcon } from './SvgIcon.tsx';
+import { AudioCallIcon, BlockContactIcon, ContactDetailsIcon, CrossIcon, MessageIcon } from './SvgIcon.tsx';
 
 const customStyles = {
   content: {