refactor(tsc): return the result of runTsc

[escaton]

Hello, I tried to find a way to use vue-tsc programmatically to pass it into tools like webpack/rspack-ts-checker, but it is currently designed to simply invoke only tsc cli.
This PR in combination with a same change on volar side will allow to make use of not just lib/tsc, but also lib/typescript and pass it to any tool that expects the typescript API as simply as

// vue-typescript.js module.exports = require('vue-tsc').runTsc(require.resolve('typescript'))

... someCheckerPlugin({ typescript: require.resolve('./vue-typescript') }) ...

[pkg-pr-new]

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commit: 0988793