Merge bitcoin/bitcoin#24147: Miniscript integration

2da94a4c6f55f7a3621f4a6f70902c52f735c868 fuzz: add a fuzz target for Miniscript decoding from Script (Antoine Poinsot)
f8369996e76dbc41a12f7b7eea14a7e7990a81c1 Miniscript: ops limit and stack size computation (Pieter Wuille)
2e55e88f86d0dd49b35d04af3f57e863498aabae Miniscript: conversion from script (Pieter Wuille)
1ddaa66eae67b102f5e37d212d366a5dcad4aa26 Miniscript: type system, script creation, text notation, tests (Pieter Wuille)
4fe29368c0ded0e62f437cab3a7c904f7fd3ad67 script: expose getter for CScriptNum, add a BuildScript helper (Antoine Poinsot)
f4e289f384efdda6c3f56e1e1c30820a91ac2612 script: move CheckMinimalPush from interpreter to script.h (Antoine Poinsot)
31ec6ae92a5d9910a26d90a6ff20bab27dee5826 script: make IsPushdataOp non-static (Antoine Poinsot)

Pull request description:

  Miniscript is a language for writing (a subset of) Bitcoin Scripts in a structured way.

  Miniscript permits:
  - To safely extend the Output Descriptor language to many more scripting features thanks to the typing system (composition).
  - Statical analysis of spending conditions, maximum spending cost of each branch, security properties, third-party malleability.
  - General satisfaction of any correctly typed ("valid" [0]) Miniscript. The satisfaction itself is also analyzable.
  - To extend the possibilities of external signers, because of all of the above and since it carries enough metadata.

  Miniscript guarantees:
  - That for any statically-analyzed as "safe" [0] Script, a witness can be constructed in the bounds of the consensus and standardness rules (standardness complete).
  - That unless the conditions of the Miniscript are met, no witness can be created for the Script (consensus sound).
  - Third-party malleability protection for the satisfaction of a sane Miniscript, which is too complex to summarize here.

  For more details around Miniscript (including the specifications), please refer to the [website](https://bitcoin.sipa.be/miniscript/).

  Miniscript was designed by Pieter Wuille, Andrew Poelstra and Sanket Kanjalkar.
  This PR is an updated and rebased version of #16800. See [the commit history of the Miniscript repository](https://github.com/sipa/miniscript/commits/master) for details about the changes made since September 2019 (TL;DR: bugfixes, introduction of timelock conflicts in the type system, `pk()` and `pkh()` aliases, `thresh_m` renamed to `multi`, all recursive algorithms were made non-recursive).

  This PR is also the first in a series of 3:
  - The first one (here) integrates the backbone of Miniscript.
  - The second one (#24148) introduces support for Miniscript in Output Descriptors, allowing for watch-only support of Miniscript Descriptors in the wallet.
  - The third one (#24149) implements signing for these Miniscript Descriptors, using Miniscript's satisfaction algorithm.

  Note to reviewers:
  - Miniscript is currently defined only for P2WSH. No Taproot yet.
  - Miniscript is different from the policy language (a high-level logical representation of a spending policy). A policy->Miniscript compiler is not included here.
  - The fuzz target included here is more interestingly extended in the 3rd PR to check a script's satisfaction against `VerifyScript`. I think it could be further improved by having custom mutators as we now have for multisig (see https://github.com/bitcoin/bitcoin/issues/23105). A minified corpus of Miniscript Scripts is available at https://github.com/bitcoin-core/qa-assets/pull/85.

  [0] We call "valid" any correctly-typed Miniscript. And "safe" any sane Miniscript, ie one whose satisfaction isn't malleable, which requires a key for any spending path, etc..

ACKs for top commit:
  jb55:
    ACK 2da94a4c6f55f7a3621f4a6f70902c52f735c868
  laanwj:
    Light code review ACK 2da94a4c6f55f7a3621f4a6f70902c52f735c868 (mostly reviewed the changes to the existing code and build system)

Tree-SHA512: d3ef558436cfcc699a50ad13caf1e776f7d0addddb433ee28ef38f66ea5c3e581382d8c748ccac9b51768e4b95712ed7a6112b0e3281a6551e0f325331de9167

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