Derive Macro Stream 

#[derive(Stream)]
{
    // Attributes available to this derive:
    #[map]
    #[from_instruction]
    #[event]
    #[snapshot]
    #[aggregate]
    #[computed]
    #[derive_from]
}

Derive macro for Stream.

This is a marker derive that enables the following attributes on struct fields:

• #[map(...)] - Map from account fields
• #[from_instruction(...)] - Map from instruction fields
• #[event(...)] - Capture instruction events
• #[snapshot(...)] - Capture entire source
• #[aggregate(...)] - Aggregate field values
• #[computed(...)] - Computed fields from other fields
• #[derive_from(...)] - Derive values from instructions