Dynamic Benchmarking DB Whitelist (#6815)

* Add `get_whitelist` api

* add whitelisted caller

* Whitelist caller

* remove caller 0

* initial piping of origin (not actual value yet)

* remove attempt to pass origin around

* Add whitelist for `DidUpdate` storage on `pallet_timestamp`

* fix traits

* only add to whitelist if !contains

* PassBy not implemented error

* Whitelist read/writes explicitly per key

* update docs

* reduce trait constraint

* copy pasta

* Apply suggestions from code review

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* rename functions @apopiak

* missed some renaming

* enable doc tests

* Update docs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

substrate/Cargo.lock

@@ -1559,6 +1559,7 @@ version = "2.0.0-rc5"
 dependencies = [
  "frame-support",
  "frame-system",
+ "hex-literal",
  "linregress",
  "parity-scale-codec",
  "paste",
@@ -1567,6 +1568,7 @@ dependencies = [
  "sp-runtime",
  "sp-runtime-interface",
  "sp-std",
+ "sp-storage",
 ]
 
 [[package]]
@@ -8047,6 +8049,7 @@ dependencies = [
  "sp-runtime-interface-test-wasm",
  "sp-state-machine",
  "sp-std",
+ "sp-storage",
  "sp-tracing",
  "sp-wasm-interface",
  "static_assertions",
@@ -8176,6 +8179,7 @@ name = "sp-storage"
 version = "2.0.0-rc5"
 dependencies = [
  "impl-serde 0.2.3",
+ "parity-scale-codec",
  "ref-cast",
  "serde",
  "sp-debug-derive",