feat(message-list): change item layout

[wmontwe]

Resolves #9654

The design is not covering the MessageListAppearance options. We need another round of discussion how to handle these.

[rafaeltonholo]

Thanks for these changes! There are a few things I believe we need to address before merging this.

[rafaeltonholo]

I also want to mention a few things that are not related to these changes, but we need to address/discuss more about them:

1. Currently, we don't have an indication of which account the message belongs to when in the Unified inbox (Require design)
2. In the previous version of the Message List, whenever we have a message that is encrypted, the preview text is replaced with *Encrypted*. The present implementation will leave it empty. We need to discuss if that is what we expect.
3. There are a few layout changes that I would like to discuss more about.

[wmontwe]

@rafaeltonholo the implementation is not complete as I mentioned above. This just adds the available ui components and a view holder with partial integration. It doesn't make sense to continue at the moment as we need to fix the design first before further adding code. I planed to create follow up tickets, but had no time yesterday.

These changes are guarded by a feature flag and I'll turn it of until we have a design update.

[wmontwe]

I also want to mention a few things that are not related to these changes, but we need to address/discuss more about them:

1. Currently, we don't have an indication of which account the message belongs to when in the Unified inbox (Require design)

2. In the previous version of the Message List, whenever we have a message that is encrypted, the preview text is replaced with `*Encrypted*`. The present implementation will leave it empty. We need to discuss if that is what we expect.

3. There are a few layout changes that I would like to discuss more about.

I know, just no time to add tickets for. I did a hard stop yesterday and wanted to discuss the design first before adding more code. Especially as the list items already have a very large api surface, that needs to be addressed too. I think this should be covered in another issue.

And the option to have alternating colors for the avatar.

[rafaeltonholo]

@rafaeltonholo the implementation is not complete as I mentioned above. This just adds the available ui components and a view holder with partial integration. It doesn't make sense to continue at the moment as we need to fix the design first before further adding code. I planed to create follow up tickets, but had no time yesterday.

These changes are guarded by a feature flag and I'll turn it of until we have a design update.

Sounds good to me! Thanks for explaining that

[rafaeltonholo]

LGTM