anchor free margin checks

[jordy25519]

Adds

export two new functions for margin calculations without the anchor account maps and other unnecessary program validation.

the incremental variant allows recalculating margin in a piecewise manner while the simplified version is similar to the existing anchor version

pub extern "C" fn margin_calculate_simplified_margin_requirement(
    user: &User,
    market_state: &MarketState,
    margin_type: MarginRequirementType,
    margin_buffer: u32,
) -> FfiResult<SimplifiedMarginCalculation>;

pub extern "C" fn incremental_margin_calculation_from_user(
    user: &User,
    market_state: &MarketState,
    margin_type: MarginRequirementType,
    timestamp: u64,
    margin_buffer: u32,
) -> IncrementalMarginCalculation;

Fixes

• rm println from program logs