devel/grid_example: add option field to showcase grid %field magic

The form %field magic works here too but let's not complicate an
example controller with it.

PR: https://github.com/opnsense/core/issues/10225

devel/grid_example/Makefile

@@ -1,5 +1,6 @@
 PLUGIN_NAME=		grid_example
 PLUGIN_VERSION=		1.1
+PLUGIN_REVISION=	1
 PLUGIN_COMMENT=		A sample framework application
 PLUGIN_MAINTAINER=	ad@opnsense.org
 

devel/grid_example/src/opnsense/mvc/app/controllers/OPNsense/GridExample/forms/dialogAddress.xml

@@ -3,7 +3,7 @@
         <id>address.enabled</id>
         <label>Enabled</label>
         <type>checkbox</type>
-        <help>Enable this address</help>
+        <help>Enable this address.</help>
         <!-- Format the grid column for enabled button-->
         <grid_view>
             <width>6em</width>
@@ -15,13 +15,19 @@
         <id>address.email</id>
         <label>Email</label>
         <type>text</type>
-        <help>Enter the email address</help>
+        <help>Enter the email address.</help>
+    </field>
+    <field>
+        <id>address.schedule</id>
+        <label>Schedule</label>
+        <type>dropdown</type>
+        <help>Select your preferred schedule.</help>
     </field>
     <field>
         <id>address.description</id>
         <label>Description</label>
         <type>text</type>
-        <help>Enter an optional description</help>
+        <help>Enter an optional description.</help>
         <!-- Hide this grid column per default -->
         <grid_view>
             <visible>false</visible>

devel/grid_example/src/opnsense/mvc/app/models/OPNsense/GridExample/GridExample.xml

@@ -1,8 +1,6 @@
 <model>
     <mount>//OPNsense/GridExample</mount>
-    <description>
-        the OPNsense "GridExample" application
-    </description>
+    <description>OPNsense "GridExample" application</description>
     <items>
         <addresses>
             <address type="ArrayField">
@@ -10,6 +8,15 @@
                     <Default>1</Default>
                     <Required>Y</Required>
                 </enabled>
+                <schedule type="OptionField">
+                    <Default>wly</Default>
+                    <Required>Y</Required>
+                    <OptionValues>
+                        <dly>Daily</dly>
+                        <wly>Weekly</wly>
+                        <mly>Monthly</mly>
+                    </OptionValues>
+                </schedule>
                 <email type="EmailField">
                     <Required>Y</Required>
                 </email>