[C++][Parquet] `PARQUET_REQUIRE_ENCRYPTION` misses `ARROW_JSON` dependency

[kou]

Describe the bug, including details regarding any error messages, version, and platform.

PARQUET_REQUIRE_ENCRYPTION needs ARROW_JSON because cpp/src/parquet/encryption/key_metadata.cc uses arrow/json/:

arrow/cpp/src/parquet/encryption/key_metadata.cc

Lines 18 to 19 in bfc9cdb

	#include "arrow/json/object_parser.h"
	#include "arrow/json/object_writer.h"

This causes a build error like #50032 (reply in thread) .

Component(s)

C++, Parquet