add payjoin support #669

Job	Run time
Rust fmt	19s
Build WASM	6m 18s
Build and test (1.65.0, default)	3m 15s
Build and test (1.65.0, electrum,sqlite-db)	3m 17s
Build and test (1.65.0, electrum,key-value-db)	3m 15s
Build and test (1.65.0, electrum)	3m 15s
Build and test (1.65.0, esplora-ureq,sqlite-db)	1s
Build and test (1.65.0, esplora-reqwest,sqlite-db)	3m 14s
Build and test (1.65.0, compiler,sqlite-db)	3m 16s
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 16s
Build and test (1.65.0, regtest-bitcoin,sqlite-db)	3m 16s
Build and test (1.65.0, regtest-electrum,sqlite-db)	1s
Build and test (1.57.0, default)	3m 9s
Build and test (1.57.0, electrum,sqlite-db)	3m 17s
Build and test (1.57.0, electrum,key-value-db)	3m 16s
Build and test (1.57.0, electrum)	3m 17s
Build and test (1.57.0, esplora-ureq,sqlite-db)	3m 6s
Build and test (1.57.0, esplora-reqwest,sqlite-db)	3m 4s
Build and test (1.57.0, compiler,sqlite-db)	3m 16s
Build and test (1.57.0, rpc,sqlite-db)	3m 10s
Build and test (1.57.0, reserves,electrum,sqlite-db)	3m 10s
Build and test (1.57.0, electrum,verify,sqlite-db)	3m 9s
Build and test (1.57.0, regtest-bitcoin,sqlite-db)	3m 0s
Build and test (1.57.0, regtest-electrum,sqlite-db)	2m 58s
	1h 10m 37s

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