A function to interpret mysql data types.

[devblack]

I needed to use the data types of my columns in mysql but they were shown as "string" in each query, so I decided to make this function that converts a limited range of mysql data types to its php interpreter.

Support mysql data types:

• 1 -> bool
• 2 -> smallint
• 3 -> int
• 4 -> float
• 5 -> double
• Default -> We check if it is null or not, otherwise we force string.

[SimonFrings]

Hey @devblack, thanks for bringing this up :+1:

This sounds like a useful addition to the project! There already are constants inside src/Io/Constants.php and I think that 1, 2, 3 etc. aren't meaningful identifiers, maybe we should use the constant names instead. Additionally there are more types than the ones you've mentioned, would it make sense to include them too?

Could you also add some tests to assure that you're changes work as expected?