Remove `new FormatException()`

[bgrainger]

Replace all instances of new FormatException() with a more detailed message explaining what was expected and what was found instead.

This will improve the user experience for scenarios such as https://stackoverflow.com/questions/70624373/error-when-trying-to-get-data-from-mysql-using-entityframeworkcore.

[bgrainger]

The only new FormatException() instances that need to be changed are the ones parsing a CHAR(36) or CHAR(32) as a Guid; every other one assumes the server will implement the text protocol correctly and not send malformed data.

[bgrainger]

Fixed in 2.1.3.