Improvements

#6044: Do not deepcopy slots when instantiating trackers. This leads to a significant
speedup when training on domains with a large number of slots.
#6226: Added more debugging logs to the lock-stores to simplify debugging in case of
connection problems.

Added a new parameter socket_timeout to the RedisLockStore. If Redis doesn't
answer within socket_timeout seconds to requests from Rasa Open Source, an error
is raised. This avoids seemingly infinitely blocking connections and exposes connection
problems early.

Bugfixes

#5182: Fixed a bug where domain fields such as store_entities_as_slots were overridden
with defaults and therefore ignored.
#6191: If two entities are separated by a comma (or any other symbol), extract them as two separate entities.
#6340: If two entities are separated by a single space and uses BILOU tagging,
extract them as two separate entities based on their BILOU tags.