Presence event engine

[parfeon]

refactor(deserializer): refactor custom deserializer configuration

Custom deserializer now can be set during client configuration.

refactor(runtime): refactor runtime environment configuration

Runtime environment now can be set during client configuration.

refactor(parse): refactor PubNub endpoint response parsing

feat(presence): add initial presence event engine

feat(presence): add set state endpoint

Add endpoint which allows associate user_id state with a list of channels and groups.