fix: advanced theming of message (myMessageTheme)

[szuperaz]

🎯 Goal

fixes #3755

Allow using light-on-dark for outgoing messages; and dark-on-light for outgoing messages. To achieve this, it's not enough to customize theme tokens; we have to use myMessageTheme to provide a completely separate theme for outgoing messages only. This is a preexsting mechanism in the SDK; but had a few small issues preventing working correctly. To verify a new cookbook is added: https://github.com/GetStream/docs-content/pull/1490

🛠 Implementation details

There were a few different theming issues here; all fixed in a separate commit in this PR:

• The theme merging wiped preexisting custom semantics, causing problems when doing theme overrides on different levels (which is what is used with myMessageTheme)
• Message list components didn't provide the current scheme (light/dark) when merging the myMessageTheme
• A various number of components used incmoing semantic tokens instead of reading isMyMessages and selecting incoming/outgoing token based on that
• Quoted message was styled based on if qouted message was sent by current user; instead of parent message was sent by current user -> this didn't cause a UI issue with the default theme; but visible when using different text colors for incoming/outgoing texts
• The default UI visibly changed on three places; all of them are verified by figma (see screenshots later):

1. The SDK unnecessarily changed failed/moderated outgoing messages background to incoming
2. When editing a message the original in the composer was always styled as incoming not outgoing
3. Opening our own poll in the poll modal used an inaccurate color for the vote circle

🎨 UI Changes

Before - failed outgoing message background changed to incoming:

After - in line with Figma:

Before - editing our own message styled as incmoing in composer:

After - in line with Figma:

Before - poll modal vote circle inaccurate color:

After - in line with Figma:

🧪 Testing

☑️ Checklist

• I have signed the Stream CLA (required)
• PR targets the develop branch
• Documentation is updated
• New code is tested in main example apps, including all possible scenarios
  • SampleApp iOS and Android
  • Expo iOS and Android

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
js_bundle_size	1991 KB	1991 KB	+488 B	🟡

[stream-ci-bot]

🎉 This PR is included in version 9.7.4 🎉

The release is available on:

• v9.7.4
• GitHub release

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