chore: allow string arrays on sort parameters

[xernobyl]

CLA

• [x] I have signed the Stream CLA (required).
• [x] Code changes are tested

Description of the changes, What, Why and How?

Added support to Sort by arrays of strings:

const { members } = await channel.queryMembers(
    {},
    { channel_role: ['channel_moderator', 'channel_member'], name: 1 },
);

Now users should be able to query members sorted by role.

Changelog