[AAE-12782] Custom theme creation (#8450)

* [AAE-12782] Create custom theme

* copied ui from ACA

* fix some lints

* Added theme

* Added theme

* lint part 1

* lint part 2

* lint part 3 backg color

* lint part 4

* lint part 5

* lint part 6

* lint part 7

* update

* fix map_merge

lib/core/custom-theme/material-theme.scss

@@ -0,0 +1,24 @@
+@use 'sass:map';
+@import './theme/theme-data';
+
+$custom-theme: mat-light-theme(
+    (
+        color: (
+            primary: map.get($palettes, primary),
+            accent: map.get($palettes, accent),
+            warn: map.get($palettes, warning),
+        ),
+        typography: $app-typography,
+    )
+);
+
+@if $background-color {
+    $custom-theme: get-custom-background-color(
+        $background-color,
+        $custom-theme
+    );
+}
+
+@if $text-color {
+    $custom-theme: get-custom-text-color($text-color, $custom-theme);
+}