feat(wallet): add transactions_sort_by function #6023

Job	Run time
Build Examples (example_cli)	28s
Build and test (stable, true, --no-default-features)	3m 55s
Build Examples (example_bitcoind_rpc_polling)	35s
Build and test (stable, true, --all-features)	3m 59s
Build Examples (example_electrum)	54s
Check no_std	32s
Build and test (1.63.0, --no-default-features)	5m 0s
Check WASM	56s
Build Examples (example_esplora)	52s
Build and test (1.63.0, --all-features)	5m 6s
Build Examples (wallet_electrum)	51s
Rust fmt	7s
prepare	2s
Build Examples (wallet_esplora_async)	49s
Build Examples (wallet_esplora_blocking)	51s
Build Examples (wallet_rpc)	36s
clippy_check	1m 10s
	26m 43s

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