Render the live location timeline item

[Velin92]

This PR introduces a new timeline item to handle the Live Location sharing.

As of right now this PR only handles the rendering of such item, but doesn't provide any actions when it is tapped.
This includes:

• 2 new location marker states, one for the live item, and one for the placeholder/stopped state
• The LLS timeline model, which is used to translated the SDK content of the LLS timeline item into the data required to render the timeline item view.
• the LLS timeline item view which either be in a loading, in a stopped or in a live state (which is rendered slightly differently between the outgoing and the received state, since in the outgoing state you are able to also stop it, but this action is still not implemented yet)
• A way to hide the timestamp/sendinfo since we don't want to render it when in a both live and outgoing state
• Updated preview tests to handle all the possible states
• The FF is also used to filter or not the beacon info events from the timeline.
• PreviewScrollView which is a nice way to keep the scrollable preview but have also a sizeThatFits preview snapshot.

NOTE: There are some bugs within the SDK that make the item no work properly sometimes like:

• isLive is always false
• The item is always marked as sent in clear even if that's not entirely true (it's due to beacon info being a non encrypted state event) but a PR with the fix on the SDK is already open: fix: live location shield gets flagged as sent in clear even when beacons are encrypted matrix-org/matrix-rust-sdk#6308
• the timeline item disappears completely after the set expiration time, instead of remaining in the timeline with the stopped state.-

These are entirely SDK issues, so they will be fixed in a future update

[codecov]

Codecov Report

❌ Patch coverage is 83.98876% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.72%. Comparing base (a402d20) to head (0239707).
⚠️ Report is 4 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...meline/TimelineItems/RoomTimelineItemFactory.swift	0.00%	20 Missing ⚠️
...om/RoomSummary/RoomMessageEventStringBuilder.swift	0.00%	8 Missing ⚠️
...melineItemViews/LiveLocationRoomTimelineView.swift	95.62%	7 Missing ⚠️
.../LocationSharing/LocationSharingScreenModels.swift	78.57%	6 Missing ⚠️
.../Items/Messages/LiveLocationRoomTimelineItem.swift	14.28%	6 Missing ⚠️
...urces/Other/SwiftUI/Views/LocationMarkerView.swift	94.00%	3 Missing ⚠️
...entX/Sources/Other/SwiftUI/PreviewScrollView.swift	66.66%	2 Missing ⚠️
ElementX/Sources/Other/Extensions/Date.swift	93.33%	1 Missing ⚠️
...s/LocationSharing/View/LocationSharingScreen.swift	83.33%	1 Missing ⚠️
...ices/Room/RoomSummary/RoomEventStringBuilder.swift	50.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5209      +/-   ##
===========================================
+ Coverage    74.66%   74.72%   +0.05%     
===========================================
  Files          787      790       +3     
  Lines        52558    52865     +307     
===========================================
+ Hits         39244    39503     +259     
- Misses       13314    13362      +48     

Flag	Coverage Δ
unittests	64.73% <83.98%> (+0.11%)	⬆️

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[stefanceriu]

It's shaping up quite nicely 👍

[stefanceriu]

I wonder if it's worth automating dark scheme preview tests. We do have a lot of screenshots already though..

[stefanceriu]

Any thoughts on this?

[stefanceriu]

Oh, one more thing, please update the PR title: LLS Timeline Item doesn't mean anything to anybody when reaching the changelog and the release notes.

[stefanceriu]

Any thoughts on this?

[stefanceriu]

Perhaps we should wrap it in a #if DEBUG so it enforces the Only use in Previews?