Add UserBlockService to Bootstrap build class map

[AndreScara11]

Added UserBlockService in the build class map to be able to overwrite it

[AndreScara11]

It seems that many other classes are missing in the class map, maybe it's worth opening an issue?

[TonisOrmisson]

Why not use the DI contauiner instead of classMap? Should also be probably workable for the "other" classes.
UserBlockService is injected as a dependency in Yii's internal container and created only via ->make(), getting the dependency from container. So you can just set your own custom class to DI container after loading this module and you should be good to go with nothing added to classMap

[mp1509]

IMHO, since usuario uses this classMap to register class definitions, it would be better to have it so you can list every override there instead of having some in another place. Also, I don't know if it'd ever be useful, but the class mapping would also be missing from the ClassMapHelper singleton.

[maxxer]

I remember I used DI in the past for classes overload. @mp1509 if you feel some classes are missing here, please add them to the PR so we have a consistent behaviour.

[AndreScara11]

I added more classes to the classMap, not all, only those of the folders already present