[IMP] website_form: add new 'email' type of field in custom fields

This commit adds possibility to add 'email' type of custom field using
form builder.

Part of https://github.com/odoo/odoo/pull/30595
task-1874350

addons/website_form/static/src/xml/website_form_editor.xml

@@ -39,6 +39,18 @@
         </t>
     </t>
 
+    <!-- Email Field -->
+    <t t-name="website_form.field_email">
+        <t t-call="website_form.field">
+            <input
+                type="email"
+                class="form-control o_website_form_input"
+                t-att-name="field.name"
+                t-att-required="field.required"
+            />
+        </t>
+    </t>
+
     <!-- HTML Field -->
     <t t-name="website_form.field_html">
         <!--

addons/website_form/views/snippets.xml

@@ -37,6 +37,7 @@
                       <we-collapse data-no-preview="true">
                           <we-button data-website_form_custom_field="char">Text</we-button>
                           <we-button data-website_form_custom_field="text">Long Text</we-button>
+                          <we-button data-website_form_custom_field="email">Email</we-button>
                           <we-button data-website_form_custom_field="integer">Number</we-button>
                           <we-button data-website_form_custom_field="float">Decimal Number</we-button>
                           <we-button data-website_form_custom_field="boolean">Checkbox</we-button>