Coretime Feature branch (relay chain) (#1694)

Also fixes: https://github.com/paritytech/polkadot-sdk/issues/1417

- [x] CoreIndex -> AssignmentProvider mapping will be able to change any
time.
- [x] Implement
- [x] Provide Migrations
- [x] Add and fix tests
- [x] Implement bulk assigner logic
- [x] bulk assigner tests
- [x] Port over current assigner to use bulk designer (+ share on-demand
with bulk): top-level assigner has core ranges: legacy, bulk
- [x] Adjust migrations to reflect new assigner structure
- [x] Move migration code to Assignment code directly and make it
recursive (make it possible to skip releases) -> follow up ticket.
- [x] Test migrations
- [x] Add migration PR to runtimes repo -> follow up ticket.
- [x] Wire up with actual UMP messages
- [x] Write PR docs

---------

Co-authored-by: eskimor <eskimor@no-such-url.com>
Co-authored-by: Bradley Olson <34992650+BradleyOlson64@users.noreply.github.com>
Co-authored-by: BradleyOlson64 <lotrftw9@gmail.com>
Co-authored-by: Anton Vilhelm Ásgeirsson <antonva@users.noreply.github.com>
Co-authored-by: antonva <anton.asgeirsson@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Marcin S. <marcin@realemail.net>
Co-authored-by: Bastian Köcher <info@kchr.de>
Co-authored-by: command-bot <>

polkadot/zombienet_tests/smoke/0004-coretime-smoke-test.toml

@@ -0,0 +1,58 @@
+[settings]
+timeout = 1000
+
+[relaychain]
+default_image = "{{ZOMBIENET_INTEGRATION_TEST_IMAGE}}"
+chain = "rococo-local"
+command = "polkadot"
+
+  [[relaychain.nodes]]
+  name = "alice"
+  args = ["-lruntime=debug,parachain=trace" ]
+
+  [[relaychain.nodes]]
+  name = "bob"
+  args = ["-lruntime=debug,parachain=trace" ]
+
+  [[relaychain.nodes]]
+  name = "charlie"
+  args = ["-lruntime=debug,parachain=trace" ]
+
+[[parachains]]
+id = 1005
+chain = "coretime-rococo-local"
+
+  [parachains.collator]
+  name = "coretime-collator"
+  image = "{{COL_IMAGE}}"
+  command = "polkadot-parachain"
+  args = [ "-lruntime=debug,parachain=trace" ]
+
+[[parachains]]
+id = 100
+add_to_genesis = false
+register_para = true
+onboard_as_parachain = false
+
+  [parachains.collator]
+  name = "adder-a"
+  image = "{{COL_IMAGE}}"
+  command = "adder-collator"
+  args = [ "-lruntime=debug,parachain=trace" ]
+
+[[parachains]]
+id = 101
+add_to_genesis = false
+register_para = true
+onboard_as_parachain = false
+
+  [parachains.collator]
+  name = "adder-b"
+  image = "{{COL_IMAGE}}"
+  command = "adder-collator"
+  args = [ "-lruntime=debug,parachain=trace" ]
+
+[types.Header]
+number = "u64"
+parent_hash = "Hash"
+post_state = "Hash"