feat: receive last_read_message_id from server

[shaljam]

receive last_read_msg_id from server

also populate last_read_message_id

CLA

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

Description of the changes, What, Why and How?

To create a QA test on the chat project, I needed this library to return a new property.
Corresponding pull request in chat: https://github.com/GetStream/chat/pull/4930

Changelog

• ReadResponse now includes last_read_msg_id received from server.
• last_read_message_id is added to type ChannelReadStatus.

[github-actions]

Size Change: +66 B (0%)

Total Size: 317 kB

Filename	Size	Change
dist/browser.es.js	69.4 kB	+14 B (0%)
dist/browser.full-bundle.min.js	37.5 kB	+9 B (0%)
dist/browser.js	70.3 kB	+16 B (0%)
dist/index.es.js	69.4 kB	+13 B (0%)
dist/index.js	70.4 kB	+14 B (0%)

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[vishalnarkhede]

Approved. But lets merge it after backend changes are deployed :)