Use clojure ex-info instead of creating our own Java classes for

src/java/com/metabase/corvus/api/ApiException.java

.../com/metabase/corvus/api/ApiFieldValidationException.java

src/metabase/api/common.clj

src/metabase/api/common/internal.clj

src/metabase/driver/generic_sql/native.clj

test/metabase/api/common_test.clj

test/metabase/driver/query_processor_test.clj

test/metabase/http_client.clj

test/metabase/test/data/users.clj