[Go-Server] Add support for DateTime Query Parameters (#16749)

* Add support for DateTime objects in the Path, Query Params, and as a List

* Fix indentation

* Add an exaple that has dateTimes
Move the date parsing into a common util in the routers.go file.

* Fix compilation issue and regen

* Use the `RequiredError` to handle this case

* Only split on a "," and not an extra 'space' after the ",".

samples/server/petstore/go-api-server/api/openapi.yaml

@@ -136,6 +136,24 @@ paths:
             type: string
           type: array
         style: form
+      - description: Find pets born after this date
+        explode: false
+        in: query
+        name: bornAfter
+        required: true
+        schema:
+          format: date-time
+          type: string
+        style: form
+      - description: Find pets born before this date
+        explode: false
+        in: query
+        name: bornBefore
+        required: false
+        schema:
+          format: date-time
+          type: string
+        style: form
       responses:
         "200":
           content: