Ava Chow e1290ce7f7 Merge bitcoin/bitcoin#35543: test: introduce ExtendedPrivateKey and ExtendedPublicKey classes
8791c4764c test: use ExtendedPrivateKey in wallet_taproot.py (rkrux)
89ceafafb9 test: use ExtendedPrivateKey in wallet_listdescriptors.py (rkrux)
bbfffcab58 test: use ExtendedPrivateKey in wallet_send.py (rkrux)
2ab6e590f7 test: use ExtendedPrivateKey in wallet_keypool.py (rkrux)
9e20118720 test: use ExtendedPrivateKey in wallet_fundrawtransaction.py (rkrux)
06af0cddbb test: use ExtendedPrivateKey in wallet_descriptor.py (rkrux)
4100fac20e test: use ExtendedPrivateKey in wallet_createwallet.py (rkrux)
ff3f6def9a test: use ExtendedPrivateKey in wallet_bumpfee.py (rkrux)
003f2a01f6 test: use ExtendedPrivateKey in feature_notifications.py (rkrux)
f988e6d6e6 test: use ExtendedPrivateKey in wallet_importdescriptors.py (rkrux)
d2a03d50ac test: add extendedkey.py unit tests by using BIP32 test vectors (rkrux)
afdb378082 test: introduce ExtendedPrivateKey and ExtendedPublicKey classes (rkrux)
4dbaa7cc65 test: generalise byte_to_base58 utility function to allow more version types (rkrux)

Pull request description:

  Many a times there has been a need to come up with dynamic xprvs and xpubs
  in the functional tests, but the lack of code that creates them dynamically has
  led to the presence of several hardcoded keys in the testing framework. This
  is not developer friendly and not self-documenting, clutters the testing code,
  and makes it difficult to update the tests in the future.

  This PR introduces two utility classes ExtendedPrivateKey and
  ExtendedPublicKey that allows the developer to create them on the fly
  to be used in the tests. I have intentionally not introduced any library for this
  purpose and have reused the existing libraries and functions in the framework.
  The implementation is supposed to provide basic functionality for creating
  xprv randomly or from a fixed seed, creating corresponding xpub, and
  deriving child xprvs and xpubs at custom derivation paths.

  I've updated many tests to show how these can be used, there are more
  tests as well that can be updated in the future to completely remove such
  non-deterministic hardcoded keys.

ACKs for top commit:
  achow101:
    ACK 8791c4764c
  w0xlt:
    ACK 8791c4764c

Tree-SHA512: f8ec4e09eaa6cc44b0f1c9a91337e570b12fb882c258be89b470de1a8cecf9d2fd40d9f02ee739dcbf639462ea7710aa145a3726f0f537f5a1f1e7772e5b019d
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