Write jest tests for Solend instructions

[0xodia]

In https://github.com/solendprotocol/solend-sdk/tree/master/src/instructions, the core instructions used heavily is

• borrowObligationLiquidity.ts
• depositObligationCollateral.ts
• depositReserveLiquidity.ts
• depositReserveLiquidityAndObligationCollateral.ts
• redeemReserveCollateral.ts
• repayObligationLiquidity.ts
• withdrawObligationCollateral.ts
• withdrawObligationCollateralAndRedeemReserveLiquidity.ts

Referencing how they are used in https://github.com/solendprotocol/solend-sdk/blob/master/src/classes/action.ts, it would be good to have some test coverage on these instructions