Function push_pumpfun_swap_instruction

pub fn push_pumpfun_swap_instruction(
    swap_config: &SwapConfig,
    central_context: &Arc<CentralContext>,
    instructions: &mut Vec<Instruction>,
    compute_unit_budget: &mut u32,
    pool: &PfBondingCurve,
)

Create and add a Pumpfun bonding curve swap instruction. For Pumpfun, token A is the bonding curve token and token B is SOL. BtoA is a buy, AtoB is a sell (consistent with Pumpswap protocol when tokens migrate).