change: change log-query string value to bool

BREAKING CHANGE

As discussed on https://github.com/PostgREST/postgrest/issues/3934#issuecomment-3362806777,
this changes log-query to use a bool value, this:

- Simplifies config for users.
- Reduces effort in testing the different combinations.

Closes #3934

test/io/configs/expected/boolean-string.config

@@ -25,7 +25,7 @@ jwt-secret = ""
 jwt-secret-is-base64 = true
 jwt-cache-max-entries = 1000
 log-level = "error"
-log-query = "disabled"
+log-query = false
 openapi-mode = "follow-privileges"
 openapi-security-active = false
 openapi-server-proxy-uri = ""