Adds fund to a LeaseAccount. Note that funds can always be withdrawn by the withdraw authority if one was set on lease initialization.

| Field | Type | Description |
|--|--|--|
| loadAmount |  u64 |  |
| leaseBump |  u8 |  |
| stateBump |  u8 | The [SbState](/idl/accounts/SbState) bump used to derive its public key. |
| walletBumps |  bytes |  |
