feat(rsc): support inline directive methods

[hi-ogawa]

• closes Align directive syntax support with Next.js #1335
• close feat(rsc): support inline server action methods #1255 (supersedes)

This PR adds support for inline directives inside methods like following to align with Next.js

const obj = {
  async someFn() {
    'use server'
  }
}
class C {
  static async someFn() {
    'use server'
  }
}