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/rpc/api/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "substrate-rpc-api"
+name = "sc-rpc-api"
 version = "2.0.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
@@ -18,5 +18,5 @@ primitives = { package = "substrate-primitives", path = "../../../primitives/cor
 runtime_version = { package = "sr-version", path = "../../../primitives/sr-version" }
 serde = { version = "1.0.101", features = ["derive"] }
 serde_json = "1.0.41"
-txpool = { package = "substrate-transaction-graph", path = "../../transaction-pool/graph" }
+txpool = { package = "sc-transaction-graph", path = "../../../client/transaction-pool/graph" }
 rpc-primitives = { package = "substrate-rpc-primitives", path = "../../../primitives/rpc" }