no-unstable-api-use: handle syntax that accesses properties

[ajafff]

declare const p :  {
  /** @deprecated */
  then<T>(cb: (v: any) => T): Promise<T>;
};

await p; // should report deprecated 'then' property

declare const i: {
  /** @deprecated */
  [Symbol.iterator](): IterableIterator<any>;
  /** @experimental */
  [Symbol.asyncIterator](): AsyncIterableIterator<any>
}

for (const _ of i) {} // should report deprecated 'Symbol.iterator' property
for await (const _ of i) {} // should report experimental 'Symbol.asyncIterator' property

declare const i2: {
  [Symbol.iterator](): {
    /** @deprecated */
    next(): IteratorResult<any>
  }
}

for (const _ of i2) {} // should report deprecated 'next' property on iterator

This is certainly possible, but I doubt this is worth the effort.