add multi output file path for cli generated interfaces

[armatrix]

Project may have multi contracts, the generated files should be separated according to the contract to make maintenance easier.
Are the following two methods feasible?

• Modify the configuration of out to mapping or array to support multiple files.
• Add out filed to the contract configuration to support specified files.
  sth like this:

export default defineConfig({ out: 'src/generated.ts', // 1. need array or mapping like for multiple outputs contracts: [ { name: 'foo', abi: foo.abi, // output: '', // 2. optional, output file for generated }, { name: 'bar', abi: bar.abi, }, ... ], plugins: [], })

[tmm]

Check out the Array Config docs.