Rename isInt64 to is_int64 and validate to_number input
#5
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bit64.isInt64tobit64.is_int64for Lua naming convention consistency. The old name is retained as an alias for backward compatibility.bit64.to_numberby adding input validation to accept only numeric values or validInt64objects created withbit64.new().bit64.from_numberto allowInt64values as direct pass-through.