Merge bitcoin/bitcoin#21506: p2p, refactor: make NetPermissionFlags an enum class

7075f604e8d0b21b2255fa57e20cd365dc10a288 scripted-diff: update noban documentation in net_processing.cpp (Jon Atack)
a95540cf435029f06e56749802d71315ca76b0dd scripted-diff: rename NetPermissionFlags enumerators (Jon Atack)
810d0929c1626bba141af3f779a3c9cd6ece7e75 p2p, refactor: make NetPermissionFlags a uint32 enum class (Jon Atack)
7b55a9449778c5ac89799ce4c607c8c8d797ddfb p2p: NetPermissions::HasFlag() pass flags param by value (Jon Atack)
91f6e6e6d1720e1154ad3f70a5098e9028efa84a scripted-diff: add NetPermissionFlags scopes where not already present (Jon Atack)

Pull request description:

  While reviewing #20196, I noticed the `NetPermissionFlags` enums are frequently called as if they were scoped, yet are still global. This patch upgrades `NetPermissionFlags` to a scoped class enum and updates the enumerator naming, similarly to #19771. See https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#enum-enumerations for more info.

  This change would eliminate the class of bugs like https://github.com/bitcoin/bitcoin/pull/20196#discussion_r610770148 and #21644, as only defined operations on the flags would compile.

ACKs for top commit:
  laanwj:
    Code review ACK 7075f604e8d0b21b2255fa57e20cd365dc10a288
  vasild:
    ACK 7075f604e8d0b21b2255fa57e20cd365dc10a288

Tree-SHA512: 7fcea66ee499f059efc78c934b5f729b3c8573fe304dee2c27c837c2f662b89324790568246d75b2a574cf9f059b42d3551d928996862f4358055eb43521e6f4

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