Introduce primitive types

[shaunxw]

Introduce primitives types in a dedicated primitives crate, something like Polkadot core primitives, including Balance, BlockNumber, AccountId, etc.

They would help to get rid of repeating primitive types definition across local/Shibuya/Shiden/Astar runtimes and collator:

Astar/runtime/astar/src/lib.rs

Lines 1064 to 1067 in 5187393

	/// Balance of an account.
	pub type Balance = u128;
	/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
	pub type Signature = sp_runtime::MultiSignature;

Astar/runtime/shiden/src/lib.rs

Lines 1053 to 1056 in 5187393

	/// Balance of an account.
	pub type Balance = u128;
	/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
	pub type Signature = sp_runtime::MultiSignature;

They can also be imported into astar pallets, making defining complex types easier by removing verbose trait bounds. For instance,

Astar/pallets/dapps-staking/src/lib.rs

Lines 173 to 180 in 5187393

	pub struct RewardInfo<Balance: HasCompact + MaxEncodedLen> {
	/// Total amount of rewards for stakers in an era
	#[codec(compact)]
	pub stakers: Balance,
	/// Total amount of rewards for dapps in an era
	#[codec(compact)]
	pub dapps: Balance,
	}

could be re-written as:

use primitives::Balance;

pub struct RewardInfo {
    /// Total amount of rewards for stakers in an era 
    #[codec(compact)] 
    pub stakers: Balance, 
    /// Total amount of rewards for dapps in an era 
    #[codec(compact)] 
    pub dapps: Balance, 
 } 

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[shaunxw]

Finished with #961