Weights for pallet-bridge-grandpa (#815)

* Add benchmarking skeleton

* Allow runtime to indicate concrete header type for benches

* Set up skeleton for benchmark tests

* Play around with mutating bench header

* Create a working test for benchmarking

* Add benches related to enacting authority set changes

* Add bench for checking effect of prec-commits/vote ancestries

* Use new `no_std` test utils in benchmarks

* Support pallet instances in benchmarking

* Use correct benchmarking instance macro

* Add instance to runtime benchmark helper impl

* Start using new justification creation API

* Allow mock header's number to be specified

* Set up benches with correct fork/depth parameters

* Use new pallet name during runtime bench setup

* Use correct `set_id` in tests

* Limit number of forks as workaround to get tests passing

* Use number of authorities which matches number of forks

* Make sure test post-conditions are checked properly

* Only read `CurrentAuthoritySet` from storage once

* Add combined benchmark for `submit_finality_proof`

* Add bench test

* Introduce config bounds related to justification verification

* Use config consts from pallet in benchmarking

* Return data relevant to benchmarks from helper functions

* Annotate `submit_finality_proof` with autogenerated weights

* Return actual weight after call execution

* Ignore Clippy warnings in bench template

* Update benchmark template

* Use `test-utils` to create test headers

* Clarify that helper is only for messages benches

* Add more documentation to benches

* Update TODOs

* Clarify return types in comment

* Fix pallet name post-merge

* Update NOTE to a TODO item

* Indicate that Config params are max values, not actual values

* Change Config validator count type to be `u32`

* Return decoded justification instead of fields

* Add missing trait bounds for tests

* Correctly issue weight refund

Thanks for spotting this Tomek!

* Update comment

* Add note about SESSION_LENGTH

* Fix benchmarking code

bridges/modules/grandpa/Cargo.toml

@@ -11,6 +11,7 @@ license = "GPL-3.0-or-later WITH Classpath-exception-2.0"
 codec = { package = "parity-scale-codec", version = "2.0.0", default-features = false }
 finality-grandpa = { version = "0.14.0", default-features = false }
 log = { version = "0.4.14", default-features = false }
+num-traits = { version = "0.2", default-features = false }
 serde = { version = "1.0", optional = true }
 
 # Bridge Dependencies
@@ -27,25 +28,33 @@ sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "master
 sp-std = { git = "https://github.com/paritytech/substrate", branch = "master" , default-features = false }
 sp-trie = { git = "https://github.com/paritytech/substrate", branch = "master" , default-features = false }
 
+# Optional Benchmarking Dependencies
+bp-test-utils = { path = "../../primitives/test-utils", default-features = false, optional = true }
+frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch = "master" , default-features = false, optional = true }
+
 [dev-dependencies]
-bp-test-utils = {path = "../../primitives/test-utils" }
 pallet-substrate-bridge = { path = "../../modules/substrate" }
 sp-io = { git = "https://github.com/paritytech/substrate", branch = "master" }
 
 [features]
 default = ["std"]
 std = [
-	"bp-runtime/std",
 	"bp-header-chain/std",
+	"bp-runtime/std",
+	"bp-test-utils/std",
 	"codec/std",
 	"finality-grandpa/std",
 	"frame-support/std",
 	"frame-system/std",
 	"log/std",
+	"num-traits/std",
 	"serde",
 	"sp-finality-grandpa/std",
 	"sp-runtime/std",
 	"sp-std/std",
 	"sp-trie/std",
 ]
-runtime-benchmarks = []
+runtime-benchmarks = [
+	"bp-test-utils",
+	"frame-benchmarking",
+]