[C++][FlightRPC] ODBC: Replace boost::beast with alternatives

[alinaliBQ]

Describe the enhancement requested

AC:

Replace boost::beast with alternatives in ODBC.

Boost Usage to be replaced:

arrow/cpp/src/arrow/flight/sql/odbc/odbc_impl/json_converter.cc

Lines 28 to 30 in e11aeee

	using boost::beast::detail::base64::encode;
	using boost::beast::detail::base64::encoded_size;
	namespace base64 = boost::beast::detail::base64;

Component(s)

FlightRPC, C++