Initial frontend for gRPC UI

src-web/components/HttpRequestLayout.tsx

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+import type { CSSProperties } from 'react';
+import React from 'react';
+import { SplitLayout } from './core/SplitLayout';
+import { RequestPane } from './RequestPane';
+import { ResponsePane } from './ResponsePane';
+
+interface Props {
+  style: CSSProperties;
+}
+
+export function HttpRequestLayout({ style }: Props) {
+  return (
+    <SplitLayout
+      style={style}
+      leftSlot={({ orientation, style }) => (
+        <RequestPane style={style} fullHeight={orientation === 'horizontal'} />
+      )}
+      rightSlot={({ style }) => <ResponsePane style={style} />}
+    />
+  );
+}