DEV: Add file_size_restriction site setting type (#24704)

This change will allow admins to configure file sizes in mb instead of
having to convert to kb.

Co-authored-by: Ella <ella.estigoy@gmail.com>

app/assets/stylesheets/common/components/_index.scss

@@ -14,6 +14,7 @@
 @import "date-picker";
 @import "date-time-input-range";
 @import "date-time-input";
+@import "file-size-input";
 @import "footer-nav";
 @import "form-template-field";
 @import "group-member-dropdown";

app/assets/stylesheets/common/components/file-size-input.scss

@@ -0,0 +1,15 @@
+.file-size-picker {
+  display: flex;
+
+  .file-size-input {
+    flex: 1;
+  }
+
+  .file-size-unit-selector {
+    flex: 0 0 8em;
+  }
+
+  .select-kit .select-kit-header {
+    border-left: 0;
+  }
+}