Merge #16753: wallet: extract PubKey from P2PK script with Solver

798a589aff64b83a0844688a661f4bd987c3340c wallet: extract PubKey from P2PK script with Solver (Sebastian Falbesoner)

Pull request description:

  The function `ExtractPubKey()` checks if a given script matches the P2PK pattern
  (`<PubKey> OP_CHECKSIG`), extracts the PubKey and additionally checks if it is
  cryptographically valid (full validation with ECC library via `CPubKey::IsFullyValid()`).

  Currently this is done manually in the following order:
  1. check if first script OP is data push with valid PubKey length (first part of pattern match), extract PubKey
  2. create `CPubKey` object with extracted PubKey
  3. fully validate public key
  4. check if last script OP is `OP_CHECKSIG` (second part of pattern match)

  Using Solver, the pattern matching and PubKey extraction can be done via a
  single step, leading to the following simplified order with shorter code:
  1. check if given script matches P2PK pattern with Solver (also contains valid PubKey length check), extracts Pubkey
  2. create `CPubKey` object with extracted Pubkey
  3. fully validate public key

ACKs for top commit:
  instagibbs:
    utACK https://github.com/bitcoin/bitcoin/pull/16753/commits/798a589aff64b83a0844688a661f4bd987c3340c
  theStack:
    > utACK [798a589](https://github.com/bitcoin/bitcoin/commit/798a589aff64b83a0844688a661f4bd987c3340c)
  sipa:
    ACK 798a589aff64b83a0844688a661f4bd987c3340c
  achow101:
    Code Review ACK 798a589aff64b83a0844688a661f4bd987c3340c

Tree-SHA512: 350358a89afed8c2a7967c50e9714a2d4a909259b50e694ce68dde3e7d0fa0bf3238d33642e73f2bdb53860f6d3f7327ca3eb6426b74eaffacfbca0a384d68cd

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