Feature: Add configurable component authority & Simplify the Components/System API

[GabrielePicco]

Feature: Add configurable component authority & Simplify the Components/System API

Status	Type	⚠️ Core Change	Issue
Ready	Feature/Tooling	Yes	#9

Problem

• Complex API for system/components
• See Add a configurable authority on the components #9

Solution

• Simplify the components/systems API

Components:

#[component]
#[derive(Copy)]
pub struct Position {
    pub x: i64,
    pub y: i64,
    pub z: i64,
}

Systems:

#[system]
pub mod system_fly {

    pub fn execute(ctx: Context<Components>, _args: Vec<u8>) -> Result<Components> {
        let pos = &mut ctx.accounts.position;
        pos.z += 1;
        Ok(ctx.accounts)
    }

    #[system_input]
    pub struct Components {
        pub position: Position,
    }
}

• Add a configurable authority on each component
• Add authority checks on update and CPI constraints on the caller

Issues

Closes #9