feat: merge MessageList and VirtualizedMessageList into a single component

[MartinCupela]

Motivation

There is no sense in keeping 2 components that should serve the same purpose. Moreover the two components do not expose the same interface. The MessageList component has problems to correctly display messages while paginating (there is jumping, visually hard to follow) what is better solved by the VirtualizedMessageList. In Thread, the VirtualizedMessageList displays the parent message in a fixed position compared to scrollable replies list. On the other side, the Thread using MessageList includes the parent message in the scrolled list.

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Acceptance Criteria

TBD