fix: Messaging error/validation messages (#134)

* feat: Use custom messages for messaging when defined

* chore: Use annotations to configure validation messages

* Add messages with priority

* Add length and label

* fix: Bad annotation

* Revert "fix: Bad annotation"

This reverts commit a7287c0.

* fix: Bad annotation

---------

Co-authored-by: Saul Wilcox <saul.wilcox@dvsa.gov.uk>

module/Olcs/src/Form/Model/Fieldset/Conversation.php

@@ -36,8 +36,14 @@ class Conversation
     public ?DynamicSelect $messageSubject = null;
 
     /**
-     * @Form\Attributes({"class": "extra-long", "id": ""})
-     * @Form\Options({"label": "Message"})
+     * @Form\Attributes({
+     *     "class": "extra-long",
+     *     "id": "",
+     *     "maxlength": 1000
+     * })
+     * @Form\Options({
+     *     "label": "You can enter up to 1000 characters",
+     * })
      * @Form\Type(Textarea::class)
      * @Form\Filter(StringTrim::class)
      * @Form\Validator("Laminas\Validator\NotEmpty",