feat(striker-ui-api): add function to combine string parts into camelcase

striker-ui-api/src/lib/camel.ts

@@ -0,0 +1,4 @@
+import { cap } from './cap';
+
+export const camel = (...[head, ...rest]: string[]): string =>
+  rest.reduce<string>((previous, part) => `${previous}${cap(part)}`, head);