message: Add test to read the value of "preserve_identifier_case"
diff: # description: Test preserve_identifier_case setting
  # group: [settings]
  +query I
  +SELECT value FROM duckdb_settings() WHERE name='preserve_identifier_case'
  +----
  +True
  +
  statement ok
  CREATE SCHEMA MYSCHEMA;
  @@ -19,6 +24,11 @@ DROP SCHEMA MYSCHEMA CASCADE
  statement ok
  SET preserve_identifier_case TO false;
  +query I
  +SELECT value FROM duckdb_settings() WHERE name='preserve_identifier_case'
  +----
  +False
  +
  statement ok
  CREATE SCHEMA MYSCHEMA;
  