feat: Support arrow getter in Object.defineProperty

[magic-akari]

This pull request add support to arrow getter in Object.defineProperty.

Object.defineProperty(exports, 'a', {
    enumerable: true,
    get: function () {
        return q.p;
    }
});

Object.defineProperty(exports, 'b', {
    enumerable: true,
    get() {
        return q.p;
    }
});

Object.defineProperty(exports, 'c', {
    enumerable: true,
    get: () => {
        return q.p;
    }
});

Object.defineProperty(exports, 'd', {
    enumerable: true,
    get: () => q.p,
});

Before this pull request, only a and b are detected.
After this pull request, c and d will also be detected.

[himself65]

/cc @guybedford

[guybedford]

@himself65 sorry, but this package is only taking bug fixes, not feature additions at this point, due to backwards compatibility requirements.