added new Code field (flask js plugin)

src/Fields/Code.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Leeto\MoonShine\Fields;
+
+
+use Illuminate\Database\Eloquent\Model;
+
+class Code extends BaseField
+{
+    protected static string $view = 'code';
+
+    public string $language = 'php';
+
+    public bool $lineNumbers = false;
+
+    protected array $assets = [
+        'js' => ['https://unpkg.com/codeflask/build/codeflask.min.js'],
+    ];
+
+    public function language(string $language): static
+    {
+        $this->language = $language;
+
+        return $this;
+    }
+
+    public function lineNumbers(): static
+    {
+        $this->lineNumbers = true;
+
+        return $this;
+    }
+
+    public function indexViewValue(Model $item, bool $container = true): string
+    {
+        return str($item->{$this->field()})
+            ->before('<pre>')
+            ->after('</pre>')
+            ->stripTags();
+    }
+}

src/views/fields/code.blade.php

@@ -0,0 +1,28 @@
+<div id="flask_{{ $field->id() }}" class="w-100 relative border" style="min-height: 300px"></div>
+
+<input type="hidden"
+       id="{{ $field->id() }}"
+       name="{{ $field->name() }}"
+       value="{{ $field->formViewValue($item) ?? '' }}"
+/>
+
+<script>
+  (function() {
+    document.addEventListener("DOMContentLoaded", function(event) {
+      const input = document.getElementById('{{ $field->id() }}');
+
+      const flask = new CodeFlask('#flask_{{ $field->id() }}', {
+        lineNumbers: {{ $field->lineNumbers ? 'true' : 'false' }},
+        language: '{{ $field->language }}',
+        readonly: {{ $field->isReadonly() ? 'true' : 'false' }},
+      });
+
+      flask.onUpdate((code) => {
+        input.value = code;
+      });
+
+      flask.updateCode(input.value);
+    });
+  })();
+</script>
+