feat(question): add type-challenges#8767 - Permuatation & Combination (type-challenges#8768)

Co-authored-by: Homyee King <[email protected]>

Author: github-actions[bot]

questions/8767-meduim-permuatation-and-combination/README.md

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+Give an array of strings, then do Permutation & Combination.
+It's also useful for the prop types like video [controlsList](https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/controlsList)
+
+```ts
+// expected to be `"foo" | "bar" | "baz" | "foo bar baz" | "bar foo" | "baz foo" | "bar baz" | "baz bar"`
+type Keys = PermutationCombination<['foo', 'bar', 'baz']>
+```

questions/8767-meduim-permuatation-and-combination/info.yml

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+difficulty: meduim
+title: Permuatation & Combination
+tags: array, application, string
+author:
+  github: HomyeeKing
+  name: Homyee King
+

questions/8767-meduim-permuatation-and-combination/template.ts

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+type PermutationCombination<T extends string[]> = any

questions/8767-meduim-permuatation-and-combination/test-cases.ts

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+import { Equal, Expect } from '@type-challenges/utils'
+
+type cases = [
+  Expect<Equal<PermutationCombination<['foo', 'bar', 'baz']>,
+  'foo' | 'bar' | 'baz' | 'foo bar baz' | 'bar foo' | 'baz foo' | 'bar baz' | 'baz bar'>>,
+]