feat: adds field visibility dropdown live component

lib/mv_web/live/member_live/index.html.heex

@@ -2,6 +2,13 @@
   <.header>
     {gettext("Members")}
     <:actions>
+      <.live_component
+        module={MvWeb.Components.FieldVisibilityDropdownComponent}
+        id="field-visibility-dropdown"
+        all_fields={@all_available_fields}
+        custom_fields={@all_custom_fields}
+        selected_fields={@user_field_selection}
+      />
       <.button
         :if={Enum.any?(@members, &MapSet.member?(@selected_members, &1.id))}
         id="copy-emails-btn"
@@ -80,6 +87,7 @@
     </:col>
     <:col
       :let={member}
+      :if={:first_name in @member_fields_visible}
       label={
         ~H"""
         <.live_component
@@ -93,7 +101,25 @@
         """
       }
     >
-      {member.first_name} {member.last_name}
+      {member.first_name}
+    </:col>
+    <:col
+      :let={member}
+      :if={:last_name in @member_fields_visible}
+      label={
+        ~H"""
+        <.live_component
+          module={MvWeb.Components.SortHeaderComponent}
+          id={:sort_last_name}
+          field={:last_name}
+          label={gettext("Last name")}
+          sort_field={@sort_field}
+          sort_order={@sort_order}
+        />
+        """
+      }
+    >
+      {member.last_name}
     </:col>
     <:col
       :let={member}