Add support for numeric fields in BigQuery Tools!

[FabianS_dup_107]

Currently you get an "Unexpected error" if you try to connect to a table with numeric fields, the solution now is to make a custom query and cast all numeric fields as string and then use a select tool to make it a double.
But to make things easier for everyone, the support for numeric fields is needed.

(It would also be great if we could connect to views without having to use a custom query....)