datatype UUID in mariadb 10.11

[arhimede]

Let's see how we can modify our migrations and seeds to work with mariadb 10.11 LTS and data type UUID

https://mariadb.com/kb/en/uuid-data-type/

and if it worth the effort in terms of performance

[arhimede]

if doctrine is ready for that

[arhimede]

@OnitaAndrei @SergiuBota1
check if the #358 may be obsolte in case of success