GemCatalog: Gem cart widget and overlay window

* [LYN-4174] Added icons for gem catalog summary cart

* [LYN-4174] Gem Catalog: Text eliding for too long gem names and creators

* [LYN-4174] Gem catalog: Resetting filters when re-initializing for another project

* [LYN-4174] Gem Catalog: Fixed a bug with filters being applied/remembered after leaving gem catalog and coming back editing another project

* [LYN-4174] GemCatalog: Gem cart widget and overlay window

* Added cart button with dynamic label to display the number of gems to be enabled/disabled and a arrow down button to indicate some sort of pop-up/overlay window will appear on click.
* Overlay gem tags update dynamically while the dialog is open based on the gem model.
* Moved some styling from C++ to the style sheet.

Code/Tools/ProjectManager/Source/GemCatalog/GemCatalogHeaderWidget.h

@@ -13,19 +13,81 @@
 #pragma once
 
 #if !defined(Q_MOC_RUN)
+#include <AzQtComponents/Components/SearchLineEdit.h>
+#include <GemCatalog/GemModel.h>
 #include <GemCatalog/GemSortFilterProxyModel.h>
+#include <TagWidget.h>
 #include <QFrame>
+#include <QLabel>
+#include <QDialog>
+#include <QMoveEvent>
+#include <QVBoxLayout>
 #endif
 
 namespace O3DE::ProjectManager
 {
+    class CartOverlayWidget
+        : public QWidget
+    {
+        Q_OBJECT // AUTOMOC
+
+    public:
+        CartOverlayWidget(GemModel* gemModel, QWidget* parent = nullptr);
+        void Update();
+
+    private:
+        QStringList ConvertFromModelIndices(const QVector<QModelIndex>& gems) const;
+
+        QVBoxLayout* m_layout = nullptr;
+        GemModel* m_gemModel = nullptr;
+
+        QWidget* m_enabledWidget = nullptr;
+        QLabel* m_enabledLabel = nullptr;
+        TagContainerWidget* m_enabledTagContainer = nullptr;
+
+        QWidget* m_disabledWidget = nullptr;
+        QLabel* m_disabledLabel = nullptr;
+        TagContainerWidget* m_disabledTagContainer = nullptr;
+
+        inline constexpr static int s_width = 240;
+    };
+
+    class CartButton
+        : public QWidget
+    {
+        Q_OBJECT // AUTOMOC
+
+    public:
+        CartButton(GemModel* gemModel, QWidget* parent = nullptr);
+        ~CartButton();
+        void ShowOverlay();
+
+    private:
+        void mousePressEvent(QMouseEvent* event) override;
+
+        GemModel* m_gemModel = nullptr;
+        QHBoxLayout* m_layout = nullptr;
+        QLabel* m_countLabel = nullptr;
+        QPushButton* m_dropDownButton = nullptr;
+        CartOverlayWidget* m_cartOverlay = nullptr;
+
+        inline constexpr static int s_iconSize = 24;
+        inline constexpr static int s_arrowDownIconSize = 8;
+    };
+
     class GemCatalogHeaderWidget
         : public QFrame
     {
         Q_OBJECT // AUTOMOC
 
     public:
-        explicit GemCatalogHeaderWidget(GemSortFilterProxyModel* filterProxyModel, QWidget* parent = nullptr);
+        explicit GemCatalogHeaderWidget(GemModel* gemModel, GemSortFilterProxyModel* filterProxyModel, QWidget* parent = nullptr);
         ~GemCatalogHeaderWidget() = default;
+
+        void ReinitForProject();
+
+    private:
+        AzQtComponents::SearchLineEdit* m_filterLineEdit = nullptr;
+        inline constexpr static int s_height = 60;
     };
 } // namespace O3DE::ProjectManager