add payjoin support #681

Job	Run time
Rust fmt	16s
Build WASM	9m 45s
Build and test (1.65.0, default)	4m 12s
Build and test (1.65.0, electrum,sqlite-db)	4m 11s
Build and test (1.65.0, electrum,key-value-db)	4m 11s
Build and test (1.65.0, electrum)	4m 14s
Build and test (1.65.0, esplora-ureq,sqlite-db)	4m 12s
Build and test (1.65.0, esplora-reqwest,sqlite-db)	4m 11s
Build and test (1.65.0, compiler,sqlite-db)	4m 12s
Build and test (1.65.0, rpc,sqlite-db)	1s
Build and test (1.65.0, reserves,electrum,sqlite-db)	1s
Build and test (1.65.0, electrum,verify,sqlite-db)	4m 13s
Build and test (1.65.0, regtest-bitcoin,sqlite-db)	1s
Build and test (1.65.0, regtest-electrum,sqlite-db)	1s
Build and test (1.57.0, default)	4m 11s
Build and test (1.57.0, electrum,sqlite-db)	4m 7s
Build and test (1.57.0, electrum,key-value-db)	4m 5s
Build and test (1.57.0, electrum)	4m 12s
Build and test (1.57.0, esplora-ureq,sqlite-db)	4m 13s
Build and test (1.57.0, esplora-reqwest,sqlite-db)	3m 58s
Build and test (1.57.0, compiler,sqlite-db)	4m 5s
Build and test (1.57.0, rpc,sqlite-db)	3m 55s
Build and test (1.57.0, reserves,electrum,sqlite-db)	4m 9s
Build and test (1.57.0, electrum,verify,sqlite-db)	4m 9s
Build and test (1.57.0, regtest-bitcoin,sqlite-db)	4m 10s
Build and test (1.57.0, regtest-electrum,sqlite-db)	4m 9s
	1h 33m 4s

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