Merge #19046: Replace CWallet::Set* functions that use memonly with Add/Load variants

3a9aba21a49a6d80bd187940d5e26893937b6832 Split SetWalletFlags into Add/LoadWalletFlags (Andrew Chow)
d9cd095b5965fc20c09f401370e7ba99446663e3 Split SetActiveScriptPubKeyMan into Add/LoadActiveScriptPubKeyMan (Andrew Chow)
0122fbab4c340b23ae56173de6c5ab866ba25ab8 Split SetHDChain into AddHDChain and LoadHDChain (Andrew Chow)

Pull request description:

  `SetHDChaiin`, `SetActiveScriptPubKeyMan`, and `SetWalletFlags` have a `memonly` argument which is kind of confusing, as noted in https://github.com/bitcoin/bitcoin/pull/17681#discussion_r427633081. This PR replaces those functions with `Add*` and `Load*` variants so that they follow the pattern used elsewhere in the wallet.

  `AddHDChain`, `AddActiveScriptPubKeyMan`, and `AddWalletFlags` both set their respective variables in `CWallet` and writes them to disk. These functions are used by the actions which modify the wallet such as `sethdseed`, `importdescriptors`, and creating a new wallet.

  `LoadHDChain`, `LoadActiveScriptPubKeyMan`, and `LoadWalletFlags` just set the `CWallet` variables. These functions are used by `LoadWallet` when loading the wallet from disk.

ACKs for top commit:
  jnewbery:
    Code review ACK 3a9aba21a49a6d80bd187940d5e26893937b6832
  ryanofsky:
    Code review ACK 3a9aba21a49a6d80bd187940d5e26893937b6832. Only changes since last review tweaks making m_wallet_flags updates more safe
  meshcollider:
    utACK 3a9aba21a49a6d80bd187940d5e26893937b6832

Tree-SHA512: 365aeaafc5ba42879c0eb797ec3beb29ab70e27f917dc880763f743420b3be6ddf797240996beed8a9ad70fb212c2590253c6b44c9dc244529c3939d9538983f

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