Add competition/shared events into activity streams

[vohtaski]

Visual interfaces is needed from @primerov

then I will implement it

[primerov]

Very nice job Evgeny! I think we need to add filters for the competition by Sport. It means you can filter the list of all the competitions by the one you like. for example, I want to see all competitions just for climbing and skiing that's it! Another thing is competitions should be displayed only from the today on. So we don't need past competitions!

[vohtaski]

please create a new separate issue for this

[vohtaski]

will do now