Support both polkadot and kusama runtimes (#704)

* Allow both polkadot and kusama runtimes

* Allow both polkadot and kusama runtimes

* Make `collator` build

* Removed kusama runtime

* Introduced common runtime

* Updated for latest substrate

* Updated CI targets

* Updated CI version check

* Removed unused dependency

* Pulled latests substrate

* Pulled latest substrate

* Fixed version

* Apply suggestions from code review

Co-Authored-By: Bastian Köcher <[email protected]>

* NEW_HEADS_IDENTIFIER moved to primitives

* Updated CI check script

* Fixed script

* Set epoch duration for polkadot

* ci: check_runtime for both runtimes

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: gabriel klawitter <[email protected]>