missing empty states in new app layout

[gileluard]

resolves #6514

Empty states for empty all chats (home space), empty space list, empty all chats (any space)

Empty state for all chats section

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[github-actions]

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[codecov-commenter]

Codecov Report

Merging #6598 (1bd8e9a) into develop (a0a6f20) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #6598      +/-   ##
===========================================
+ Coverage     6.26%    6.27%   +0.01%     
===========================================
  Files         1456     1457       +1     
  Lines       153974   154111     +137     
  Branches     61899    61939      +40     
===========================================
+ Hits          9646     9670      +24     
- Misses      143922   144033     +111     
- Partials       406      408       +2     

Impacted Files	Coverage Δ
Riot/Generated/Images.swift	54.76% <ø> (ø)
Riot/Generated/Strings.swift	2.87% <0.00%> (-0.01%)	⬇️
...les/Common/Recents/DataSources/RecentsDataSource.m	6.86% <0.00%> (-0.05%)	⬇️
...Recents/Service/MatrixSDK/RecentsListService.swift	12.03% <0.00%> (ø)
...ecents/Views/RecentEmptySectionTableViewCell.swift	0.00% <0.00%> (ø)
...Modules/Home/AllChats/AllChatsViewController.swift	0.00% <0.00%> (ø)
...t/SpaceSelector/MockSpaceSelectorScreenState.swift	0.00% <0.00%> (ø)
...ector/Service/MatrixSDK/SpaceSelectorService.swift	0.00% <0.00%> (ø)
...BottomSheet/SpaceSelector/View/SpaceSelector.swift	0.00% <0.00%> (ø)
...ing/SplashScreen/View/OnboardingSplashScreen.swift	58.66% <0.00%> (+4.00%)	⬆️
... and 2 more

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[aringenbach]

LGTM!