remove AllSubsystems and AllSubsystemsGen types (#3874)

* introduce the OverseerConnector, use it

* introduce is_relay_chain to RelayChainSelection

* Update node/service/src/lib.rs

Co-authored-by: Andronik Ordian <write@reusable.software>

* avoid the deferred setting of `is_relay_chain` in `RelayChainSelection`

* positive assertion is not mandated, only the negative one, to avoid a stall

* cleanup: overseer residue

* spellcheck

* fixin

* groundwork to obsolete Overseer::new and AllSubsystemsGen proc-macro

* Now all malus & tests can be ported to the builder pattern.

Obsoletes `Overseer::new`, `AllSubsystemsGen` derive macro, `AllSubsystems`.

* spellcheck

* adjust tests, minor fixes

* remove derive macro AllSubsystemsGen

* add forgotten file dummy.rs

* remove residue

* good news everyone!

* spellcheck

* address review comments

* fixup imports

* make it conditional

* fixup docs

* reduce import

* chore: fmt

* chore: fmt

* chore: spellcheck / nlprules

* fixup malus variant-a

* fmt

* fix

* fixins

* pfmt

* fixins

* chore: fmt

* remove expanded overseer generation

* tracing version

* Update node/network/statement-distribution/src/lib.rs

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

* use future::ready instead

* silence warning

* chore: fmt

Co-authored-by: Andronik Ordian <write@reusable.software>
Co-authored-by: Robert Habermeier <rphmeier@gmail.com>

polkadot/runtime/parachains/src/hrmp.rs

@@ -387,7 +387,7 @@ pub mod pallet {
 		/// parameters.
 		///
 		/// - `proposed_max_capacity` - specifies how many messages can be in the channel at once.
-		/// - `proposed_max_message_size` - specifies the maximum size of any of the messages.
+		/// - `proposed_max_message_size` - specifies the maximum size of the messages.
 		///
 		/// These numbers are a subject to the relay-chain configuration limits.
 		///