Remove all (non-dev) client references from frame, activate dependency enforcer (#4184)

* Move transaction pool to primitives

* move backend, errors into primitives

* remove unused client depencies

* Move rpc-api into primitives

* Move peerset back to client

* Move rpc/api back to client, move palette/support/rpc into utils

* move support-rpc into subfolder

* move system-rpc into utils

* move transaction-pool  and -graph back into client

* fix broken imports

* Clean up test primitives

* Make support test utils independent of frame

* remove unnecessary node dependencies from service

* Reactivate dependency script:
 - only enforce the now achieved status quo will remain
 - allow for primitives to depend on /client for now without failing
 - more discriptive error message so people understand, what it wants
 - minor fix to differentiative between ../client and /client (which may be a subfolder)
 - don't allow this to fail anylonger.

* fix doc comment

* 'Should not' rather than 'must not'.

* Revert unwanted dependency changes

* fix faulty import

* fixup derive_more version

* fix wrong import path

substrate/client/cli/src/error.rs

@@ -16,8 +16,6 @@
 
 //! Initialization errors.
 
-use client_api;
-
 /// Result type alias for the CLI.
 pub type Result<T> = std::result::Result<T, Error>;
 
@@ -31,7 +29,7 @@ pub enum Error {
 	/// Service error
 	Service(service::Error),
 	/// Client error
-	Client(client_api::error::Error),
+	Client(sp_blockchain::Error),
 	/// Input error
 	#[from(ignore)]
 	Input(String),