add payjoin support #685

Job	Run time
Build WASM	3m 5s
Rust fmt	13s
Build and test (1.65.0, default)	1m 6s
Build and test (1.65.0, electrum,sqlite-db)	1m 5s
Build and test (1.65.0, electrum,key-value-db)	1m 6s
Build and test (1.65.0, electrum)	1m 6s
Build and test (1.65.0, esplora-ureq,sqlite-db)	1m 5s
Build and test (1.65.0, esplora-reqwest,sqlite-db)	1m 6s
Build and test (1.65.0, compiler,sqlite-db)	1m 5s
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)	1m 5s
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)	51s
Build and test (1.57.0, electrum,sqlite-db)	56s
Build and test (1.57.0, electrum,key-value-db)	57s
Build and test (1.57.0, electrum)	53s
Build and test (1.57.0, esplora-ureq,sqlite-db)	52s
Build and test (1.57.0, esplora-reqwest,sqlite-db)	52s
Build and test (1.57.0, compiler,sqlite-db)	57s
Build and test (1.57.0, rpc,sqlite-db)	55s
Build and test (1.57.0, reserves,electrum,sqlite-db)	51s
Build and test (1.57.0, electrum,verify,sqlite-db)	55s
Build and test (1.57.0, regtest-bitcoin,sqlite-db)	1m 6s
Build and test (1.57.0, regtest-electrum,sqlite-db)	56s
	23m 7s

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