Adds cast function to DataType/ConcreteDataType

[killme2008]

What type of enhancement is this?

API improvement

What does the enhancement do?

We need a function to cast a Value into the specific data type just like:

let  n= Value::Int64(1694589525);

// cast int64 into TimestampSecondType
let ts = ConcreteDataType::Timestamp(TimestampType::TimestampSecondType).cast(n).unwrap();

The signature of cast may be:

fn cast(value: Value) -> Option<Value>;

If the value can't be cast into the datatype, return None.

Implementation challenges

No response

[QuenKar]

I will add cast function.