fix: export useTablekitTheme hook

Author: SashaShostyr

system/react/src/index.ts

@@ -154,4 +154,7 @@ export { TableButtonCell } from './structuredComponents/TableButtonCell';
 export type { Props as TableButtonCellProps } from './structuredComponents/TableButtonCell';
 export { TextArea } from './structuredComponents/TextArea';
 export type { Props as TextAreaProps } from './structuredComponents/TextArea';
-export { ThemeProvider } from './structuredComponents/ThemeProvider';
+export {
+  useTablekitTheme,
+  ThemeProvider
+} from './structuredComponents/ThemeProvider';

system/react/src/structuredComponents/ThemeProvider.tsx

@@ -1,7 +1,8 @@
 import {
   ThemeProvider as EmotionThemeProvider,
   Global,
-  css
+  css,
+  useTheme
 } from '@emotion/react';
 import {
   constants,
@@ -54,6 +55,8 @@ function useIsDark(theme: 'light' | 'dark' | 'system') {
   return isDark;
 }
 
+export const useTablekitTheme = useTheme;
+
 export function ThemeProvider({
   isRtl = false,
   lang,