feat: Update swagger to openapi 3.0.4, update request payloads with examples (#11533)

# Pull Request Template

## Description

Updates the public swagger spec to be OpenAPI 3.0.4 compliant. Regarding
#7893, I'm investigating the use of
[oas_rails](https://github.com/a-chacon/oas_rails) to auto-generate the
documentation along with correct expected payloads.
Mostly fixes #10531, related to #7893

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality not to work as expected)
- [ ] This change requires a documentation update

## How Has This Been Tested?

Copied spec into swagger editor, reviewed outputs:

![openapi](https://github.com/user-attachments/assets/bd43f895-74bb-4373-ba6d-c5b190b699dd)

Note that this shows two errors with the `DELETE` endpoints as
technically these should not have a `requestBody` - in which case we
should be making use of another HTTP verb or another endpoint.

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Daniel Jimenez <devildan.knex@gmail.com>
Co-authored-by: Daniel Jimenez <daniel.jimenez@spark64.com>

swagger/definitions/resource/contact_detail.yml

@@ -0,0 +1,48 @@
+type: object
+properties:
+  additional_attributes:
+    type: object
+    description: The object containing additional attributes related to the contact
+    properties:
+      city:
+        type: string
+        description: City of the contact
+      country:
+        type: string
+        description: Country of the contact
+      country_code:
+        type: string
+        description: Country code of the contact
+      created_at_ip:
+        type: string
+        description: IP address when the contact was created
+  custom_attributes:
+    type: object
+    description: The custom attributes of the contact
+  email:
+    type: string
+    description: The email address of the contact
+  id:
+    type: integer
+    description: The ID of the contact
+  identifier:
+    type: string
+    description: The identifier of the contact
+    nullable: true
+  name:
+    type: string
+    description: The name of the contact
+  phone_number:
+    type: string
+    description: The phone number of the contact
+    nullable: true
+  thumbnail:
+    type: string
+    description: The thumbnail of the contact
+  blocked:
+    type: boolean
+    description: Whether the contact is blocked
+  type:
+    type: string
+    description: The type of entity
+    enum: ["contact"]