Permission to view synonyms, not administer them

Added a permission/entity view hook for this.

Example jsonapi response with an anonymous user, with access to view

{"jsonapi":{"version":"1.0","meta":{"links":{"self":{"href":"http:\/\/jsonapi.org\/format\/1.0\/"}}}},"data":[{"type":"search_api_synonym--search_api_synonym","id":"abb09e71-552d-4ad0-bf75-804b0e969469","links":{"self":{"href":"https:\/\/drupal-11.ddev.site\/jsonapi\/search_api_synonym\/search_api_synonym\/abb09e71-552d-4ad0-bf75-804b0e969469"}},"attributes":{"drupal_internal__sid":4,"langcode":"en","search_api_synonym_type":"spelling_error","word":"marmelade","synonyms":"marmalade,mermelad,marmellade","status":true,"created":"2025-04-27T13:01:40+00:00","changed":"2025-04-27T13:01:40+00:00","field_asddsadasd":null},"relationships":{"uid":{"data":{"type":"user--user","id":"1f83400a-0892-4ed0-99b3-1379d9c831b3","meta":{"drupal_internal__target_id":1}},"links":{"related":{"href":"https:\/\/drupal-11.ddev.site\/jsonapi\/search_api_synonym\/search_api_synonym\/abb09e71-552d-4ad0-bf75-804b0e969469\/uid"},"self":{"href":"https:\/\/drupal-11.ddev.site\/jsonapi\/search_api_synonym\/search_api_synonym\/abb09e71-552d-4ad0-bf75-804b0e969469\/relationships\/uid"}}}}}],"links":{"self":{"href":"https:\/\/drupal-11.ddev.site\/jsonapi\/search_api_synonym\/search_api_synonym"}}}

Testing steps

1. Enable this module
2. Enable jsonapi
3. Assign the new permission view search api synonyms to relevant roles
4. Go to /jsonapi/search_api_synonym/search_api_synonym

Expected: if the user has the permission, they should be able to view the synonyms as json

1. Remove the permission from the same roles
2. Go to /jsonapi/search_api_synonym/search_api_synonym

Expected: The synonyms should not be viewable (we should see the same response from the original ticket description).

Hi @aaron.ferris

Manually tested MR !25.

• Confirmed the issue initially: anonymous users received `The 'administer search api synonyms' permission is required` when accessing `/jsonapi/search_api_synonym/search_api_synonym`.
• Checked out the MR !25 branch locally.
• Created two synonym entries (one regular synonym and one spelling error) to test.
• Granted the new permission `View search api synonyms` to the Anonymous role.
• Retested the endpoint as an anonymous user.
• Synonym entities were successfully returned in the JSON:API response.
• Removing the permission again blocks access as expected.