DBInterface.execute type unstable

[theogf]

The current version of DBInterface use the strict keyword as a type parameter for the returned Query.

This is type unstable but could easily be solved by using Val instead.

See here:

SQLite.jl/src/tables.jl

Line 146 in ccdb8b0

function DBInterface.execute(

We can keep the current interface (type unstable) by turning the keyword into a Val but having a type stable version would be great. I will be happy to open a PR.

[theogf]

Just noticed the discussion in #328 which is related to the strict keyword issue.