Add toggleable chat drawer in call

During a call, the chat button is enabled and lets the user open the
chat drawer.

GitLab: #177
Change-Id: I7a2ae09fca5af904c3280bc948a2d36135c1c63d
diff --git a/client/src/components/CallChatDrawer.tsx b/client/src/components/CallChatDrawer.tsx
new file mode 100644
index 0000000..d2040d7
--- /dev/null
+++ b/client/src/components/CallChatDrawer.tsx
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2022 Savoir-faire Linux Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+import { Divider, Stack, Typography } from '@mui/material';
+import { useContext } from 'react';
+
+import { CallContext } from '../contexts/CallProvider';
+import { ConversationContext } from '../contexts/ConversationProvider';
+import ChatInterface from '../pages/ChatInterface';
+import { CloseButton } from './Button';
+
+export default () => {
+  return (
+    <Stack
+      width="33%"
+      height="100%"
+      sx={{
+        backgroundColor: 'white',
+      }}
+    >
+      <CallChatDrawerHeader />
+      <Divider
+        sx={{
+          borderTop: '1px solid #E5E5E5',
+        }}
+      />
+      <ChatInterface />
+    </Stack>
+  );
+};
+
+const CallChatDrawerHeader = () => {
+  const { setIsChatShown } = useContext(CallContext);
+  const { conversation } = useContext(ConversationContext);
+
+  // TODO: Improve this to support multiple members
+  const contact = conversation.getFirstMember().contact;
+
+  return (
+    <Stack direction="row" padding={2} spacing={2} alignItems="center">
+      <CloseButton
+        onClick={() => {
+          setIsChatShown(false);
+        }}
+      />
+      <Stack direction="column">
+        <Typography variant="h3" textOverflow="ellipsis">
+          {contact.getDisplayName()}
+        </Typography>
+      </Stack>
+    </Stack>
+  );
+};