Screenshots APIs: add the `stringIds` parameter support

[andrii-bodnar]

The List Screenshots API has a new parameter called stringIds which allows you to filter screenshots by multiple string identifiers.

The existing stringId parameter is deprecated and will be removed in the future.

Things to do:

• Add support for the stringIds parameter in this API client.
• Mark the `stringId' parameter as deprecated.
• Check if other parameters need to be updated.

References:

• List Screenshots