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3a4f8bc242bench: add benchmark for wallet 'AvailableCoins' function. (furszy) Pull request description: #### Rationale `AvailableCoins` is part of several important flows for the wallet; from RPC commands that create transactions like `fundrawtransaction`, `send`, `walletcreatefundedpsbt`, get the available balance, list the available coins with `listunspent` etc. to GUI connected processes that perform the same or similar actions: tx creation, available balance calculation, present the spendable coins in the coin control dialog. As we are improving this process in #24699, #25005 and there are more structural changes coming on the way. This benchmark aims to ensure us that, at least, there are no regressions (obviously performance improvements are great but, at least for me, this heads into the direction of having a base metric to compare future structural changes). #### Implementation Notes There are 5 new benchmarks, one per wallet supported output type (LEGACY, P2SH_SEGWIT, BECH32, BECH32M), plus a multi-output-type wallet benchmark which contains outputs from all the descriptor types. The test, by default, fills-up the wallet with 1k transactions, 2k outputs. Mainly to not consume much time if the user just want to verify that no substantial regressions were introduced. But, my expectation for those who are focused on this process is to use a much higher number locally to really note the differences across commits. ACKs for top commit: achow101: ACK3a4f8bc242hernanmarino: ACK3a4f8bc242aureleoules: ACK3a4f8bc242Tree-SHA512: d0bb4c165f1efa181b47cb31561e6217eff9135bcd1b6761a7292f9018e456d13d18a1b886c2e2268d35c52f9e1fd8e0f252972424e5c5f00c280620b79c5a1b
Bitcoin Core integration/staging tree
For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.
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Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.
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