Merge bitcoin/bitcoin#28172: refactor: use string_view for passing string literals to Parse{Hash,Hex}

bb91131d545d986aab81c4bb13676c4520169259 doc: remove out-of-date external link in src/util/strencodings.h (Jon Atack)
7d494a48ddf4248ef3b1753b6e7f2eeab3a8ecb7 refactor: use string_view to pass string literals to Parse{Hash,Hex} (Jon Atack)

Pull request description:

  as `string_view` is optimized to be trivially copiable, whereas the current code creates a `std::string` copy at each call.

  These utility methods are called by quite a few RPCs and tests, as well as by each other.

  ```
  $ git grep "ParseHashV\|ParseHashO\|ParseHexV\|ParseHexO" | wc -l
  61
  ```

  Also remove an out-of-date external link.

ACKs for top commit:
  jonatack:
    Rebased per `git range-diff c9273f6 b94581a bb91131` for an include header from the merge of https://github.com/bitcoin/bitcoin/pull/28230. Should be trivial to re-ACK.
  maflcko:
    lgtm ACK bb91131d545d986aab81c4bb13676c4520169259
  ns-xvrn:
    ACK https://github.com/bitcoin/bitcoin/commit/bb91131d545d986aab81c4bb13676c4520169259
  achow101:
    ACK bb91131d545d986aab81c4bb13676c4520169259
  brunoerg:
    crACK bb91131d545d986aab81c4bb13676c4520169259

Tree-SHA512: 9734fe022c9e43fd93c23a917770d332dbbd3132c80a234059714c32faa6469391e59349954749fc86c4ef0b18d5fd99bf8f4b7b82d9f799943799c1253272ae

0 files changed, 0 insertions, 0 deletions