feat: add flat config support #9

Job	Run time
Lint and Test with Node.js 18 and ESLint 8.56 on macos-latest	46s
Lint and Test with Node.js 18 and ESLint 8 on macos-latest	1m 17s
Lint and Test with Node.js 18 and ESLint 9 on macos-latest	42s
Lint and Test with Node.js 20 and ESLint 8.56 on macos-latest	26s
Lint and Test with Node.js 20 and ESLint 8 on macos-latest	9s
Lint and Test with Node.js 20 and ESLint 9 on macos-latest	9s
Lint and Test with Node.js 22 and ESLint 8.56 on macos-latest	1s
Lint and Test with Node.js 22 and ESLint 8 on macos-latest	1s
Lint and Test with Node.js 22 and ESLint 9 on macos-latest	1s
Lint and Test with Node.js 18 and ESLint 8.56 on ubuntu-latest	1m 21s
Lint and Test with Node.js 18 and ESLint 8 on ubuntu-latest	1m 26s
Lint and Test with Node.js 18 and ESLint 9 on ubuntu-latest	1m 22s
Lint and Test with Node.js 20 and ESLint 8.56 on ubuntu-latest	1m 27s
Lint and Test with Node.js 20 and ESLint 8 on ubuntu-latest	1m 28s
Lint and Test with Node.js 20 and ESLint 9 on ubuntu-latest	1m 27s
Lint and Test with Node.js 22 and ESLint 8.56 on ubuntu-latest	1m 18s
Lint and Test with Node.js 22 and ESLint 8 on ubuntu-latest	1m 18s
Lint and Test with Node.js 22 and ESLint 9 on ubuntu-latest	1m 22s
	16m 1s

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