Show full timestamp on hover

[ginnyTheCat]

Description

Shows the full date when hovering over a time of a message or event. It also changes it to not be date anymore for past days as the date can now be found out by hovering over the time.

Fixes #684

Type of change

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

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[kfiven]

The format we planned when this was added was:

• HH:MM AM/PM for the current day.
• Yesterday HH:MM AM/PM for the past one day. (wasn't added)
• DD/MM/YYYY for the rest of the timeline.
  And upon hovering over all of these we can see the full timestamp.

Since the date separator scroll with timeline, the HH:MM in all cases gets really confusing and was the reason for date for older messages.

[ginnyTheCat]

Should I add the yesterday case in as well?

[kfiven]

That'll be good addition.

[ajbura]

Message component is also used in RoomSearch.jsx so we need to change the time prop to timestamp there also.

Otherwise looks good