Merge pull request #1891 from tnull/2022-12-rename-payment-events

Rename `PaymentReceived` to `PaymentClaimable`

diff --cc fuzz/src/chanmon_consistency.rs
Simple merge

diff --cc lightning/src/ln/channelmanager.rs
Simple merge

diff --cc lightning/src/ln/functional_tests.rs
Simple merge

diff --cc lightning/src/ln/payment_tests.rs
Simple merge