Blocks carry full attestations for candidates (#42)

* statement table yields fully-attested candidates

* attestation types in polkadot-primitives

* propose block with fully-attested candidates in consensus

* some signature-checking logic in the runtime

* fix runtime compilation

* ensure attestations are full and without duplicate when checking

* fix consensus-service compilation

* add some tests

* use bitvec from crates.io now that it's published

* sign statements based on primitive statement's encoding

* remove some serialize bounds

* Fix error message with duplicate availability attestations

Co-Authored-By: rphmeier <rphmeier@gmail.com>

polkadot/runtime/wasm/Cargo.lock

@@ -6,6 +6,11 @@ dependencies = [
  "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "bitvec"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "byteorder"
 version = "1.2.7"
@@ -133,6 +138,7 @@ dependencies = [
 name = "polkadot-runtime"
 version = "0.1.0"
 dependencies = [
+ "bitvec 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "integer-sqrt 0.1.0 (git+https://github.com/paritytech/integer-sqrt-rs.git)",
  "parity-codec 2.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec-derive 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -543,6 +549,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
 "checksum arrayvec 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)" = "a1e964f9e24d588183fcb43503abda40d288c8657dfc27311516ce2f05675aef"
+"checksum bitvec 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e37e2176261200377c7cde4c6de020394174df556c356f965e4bc239f5ce1c5a"
 "checksum byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "94f88df23a25417badc922ab0f5716cc1330e87f71ddd9203b3a3ccd9cedf75d"
 "checksum crunchy 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "a2f4a431c5c9f662e1200b7c7f02c34e91361150e382089a8f2dec3ba680cbda"
 "checksum crunchy 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c240f247c278fa08a6d4820a6a222bfc6e0d999e51ba67be94f44c905b2161f2"

polkadot/runtime/wasm/Cargo.toml

@@ -7,6 +7,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 crate-type = ["cdylib"]
 
 [dependencies]
+bitvec = { version = "0.8", default-features = false, features = ["alloc"] }
 integer-sqrt = { git = "https://github.com/paritytech/integer-sqrt-rs.git", branch = "master" }
 polkadot-primitives = { path = "../../primitives", default-features = false }
 safe-mix = { version = "1.0", default-features = false }