add payjoin support #690

Job	Run time
Rust fmt	17s
Build WASM	3m 55s
Build and test (1.65.0, default)	1m 43s
Build and test (1.65.0, electrum,sqlite-db)	1m 42s
Build and test (1.65.0, electrum,key-value-db)	1m 43s
Build and test (1.65.0, electrum)	1m 41s
Build and test (1.65.0, esplora-ureq,sqlite-db)	1s
Build and test (1.65.0, esplora-reqwest,sqlite-db)	1m 25s
Build and test (1.65.0, compiler,sqlite-db)	1m 43s
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 42s
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)	1m 30s
Build and test (1.57.0, electrum,sqlite-db)	1m 27s
Build and test (1.57.0, electrum,key-value-db)	1m 25s
Build and test (1.57.0, electrum)	1m 25s
Build and test (1.57.0, esplora-ureq,sqlite-db)	1m 25s
Build and test (1.57.0, esplora-reqwest,sqlite-db)	1m 28s
Build and test (1.57.0, compiler,sqlite-db)	1m 32s
Build and test (1.57.0, rpc,sqlite-db)	1m 27s
Build and test (1.57.0, reserves,electrum,sqlite-db)	1m 32s
Build and test (1.57.0, electrum,verify,sqlite-db)	1m 26s
Build and test (1.57.0, regtest-bitcoin,sqlite-db)	1m 29s
Build and test (1.57.0, regtest-electrum,sqlite-db)	1m 29s
	33m 31s

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