Add `total_value_received` to `ClaimableHTLC` for claim validation

Add `total_value_received` to `ClaimableHTLC` for claim validation

This is pre-work for allowing nodes to overshoot onion values and
changing validation for MPP completion. This adds a field to
`ClaimableHTLC` that is separate from the onion values, which
represents the actual received amount reported in `PaymentClaimable`
which is what we want to validate against when a user goes to claim.