add payjoin support #670

Job	Run time
Rust fmt	20s
Build WASM	1m 40s
Build and test (1.65.0, default)	3m 16s
Build and test (1.65.0, electrum,sqlite-db)	3m 17s
Build and test (1.65.0, electrum,key-value-db)	3m 13s
Build and test (1.65.0, electrum)	3m 12s
Build and test (1.65.0, esplora-ureq,sqlite-db)	3m 12s
Build and test (1.65.0, esplora-reqwest,sqlite-db)	3m 14s
Build and test (1.65.0, compiler,sqlite-db)	3m 11s
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)	3m 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)	3m 12s
Build and test (1.57.0, electrum,sqlite-db)	2m 57s
Build and test (1.57.0, electrum,key-value-db)	2m 58s
Build and test (1.57.0, electrum)	3m 2s
Build and test (1.57.0, esplora-ureq,sqlite-db)	3m 8s
Build and test (1.57.0, esplora-reqwest,sqlite-db)	3m 15s
Build and test (1.57.0, compiler,sqlite-db)	3m 13s
Build and test (1.57.0, rpc,sqlite-db)	2m 57s
Build and test (1.57.0, reserves,electrum,sqlite-db)	3m 1s
Build and test (1.57.0, electrum,verify,sqlite-db)	3m 7s
Build and test (1.57.0, regtest-bitcoin,sqlite-db)	3m 13s
Build and test (1.57.0, regtest-electrum,sqlite-db)	2m 59s
	1h 4m 54s

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