fix: increasing/decreasing member count on member event cause incorrect member count

[szuperaz]

The issue:
When adding more than one member at once to a channel, this is the WS event sequence I get:

• Channel has 4 members now, we're adding 2 new members in a single API call
• member.added event arrives -> stream-chat-js increases member count by one, current value is 5
• channel.updated event arrives with member count 6 -> stream-chat-js sets member count from WS event to 6
• member.added event arrives -> stream-chat-js increases member count by one, current value is 7 ❌

The solution:
Since channel.updated is dispatched every time we add/remove members, it's safe to set member count only from that event, and don't increase/decrease counter on member events.

CLA

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

Description of the changes, What, Why and How?

Changelog

[MartinCupela]

@szuperaz could you add tests for this, please?

[szuperaz]

@szuperaz could you add tests for this, please?

Do you mean a negative test checking we don't change counter on member events?

[szuperaz]

@szuperaz could you add tests for this, please?

Added tests in this commit: f1db7dc

[github-actions]

Size Change: -148 B (-0.04%)

Total Size: 393 kB

📦 View Changed

Filename	Size	Change
dist/cjs/index.browser.js	131 kB	-49 B (-0.04%)
dist/cjs/index.node.js	132 kB	-49 B (-0.04%)
dist/esm/index.mjs	130 kB	-50 B (-0.04%)

_{compressed-size-action}