[space] Switch from Bintray to public Space maven repo for Space SDK artifacts
[space] Switch from Bintray to public Space maven repo for Space SDK artifacts

Bintray will be shutdown on 2021-05-01, so we moved existing Space SDK artifacts
from bintray to the public JetBrains Space maven repository.

GitOrigin-RevId: 338e2002e501ea321e941eafebc42e7c7b32347f
allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community