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/utils/frame/rpc/support/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "substrate-frame-rpc-support"
+version = "2.0.0"
+authors = ["Parity Technologies <admin@parity.io>", "Andrew Dirksen <andrew@dirksen.com>"]
+edition = "2018"
+
+[dependencies]
+futures = { version = "0.3.0", features = ["compat"] }
+jsonrpc-client-transports = "14"
+jsonrpc-core = "14"
+parity-scale-codec = "1"
+serde = "1"
+frame-support = { path = "../../../../frame/support" }
+substrate-primitives-storage = { path = "../../../../primitives/core/storage" }
+sc-rpc-api = { path = "../../../../client/rpc/api" }
+
+[dev-dependencies]
+frame-system = { path = "../../../../frame/system" }
+tokio = "0.1"