Add expand/collapse UI for reactions (#1249)

* Add expand/collapse UI for reactions

- Adds a CollapsibleFlowLayout for controlling the layout
- Adds tests for  this layout and some mocks for testing layouts generally
- Improves the rendering of the reaction buttons which were not pixel perfect
- Adds the UI for the expand collapse buttons including the count of hidden items in the collapsed state.

* Add comment for reactionsCollapsed binding.

* Remove Flow and simplify implementation

- Remove SwiftUI-Flow
- Add strings by importing from Localyse
- Remove count on expand button as requires GeometryReader and can cause loops
- Don't use GeometryReader for hiding reactions with opacity(just put them way off screen for now)
- Fix unit and UI tests

* Address PR comments

- use synthesized inits
- use rows rather than lines for naming flow layout
- other naming improvements
- reactions were already rendered in another ui test, removing my test on favour of those and updating the screenshots for those.

ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -142,15 +142,6 @@
         "version" : "1.0.0"
       }
     },
-    {
-      "identity" : "swift-argument-parser",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/apple/swift-argument-parser",
-      "state" : {
-        "revision" : "fee6933f37fde9a5e12a1e4aeaa93fe60116ff2a",
-        "version" : "1.2.2"
-      }
-    },
     {
       "identity" : "swift-case-paths",
       "kind" : "remoteSourceControl",
@@ -214,15 +205,6 @@
         "version" : "6.0.1"
       }
     },
-    {
-      "identity" : "swiftui-flow",
-      "kind" : "remoteSourceControl",
-      "location" : "https://github.com/tevelee/SwiftUI-Flow",
-      "state" : {
-        "revision" : "d592b610a92869b74ede8ee4c0435a29219be9d8",
-        "version" : "1.2.0"
-      }
-    },
     {
       "identity" : "swiftui-introspect",
       "kind" : "remoteSourceControl",