886f1731bec4393dd342403ac34069a3a4f95eea Key pool: Fix omitted pre-split count in GetKeyPoolSize (Andrew Chow)
386a994b853bc5b3a2ed0d812673465b8ffa4849 Key pool: Change ReturnDestination interface to take address instead of key (Andrew Chow)
ba41aa4969169cd73d6b4f57444ed7d8d875de10 Key pool: Move LearnRelated and GetDestination calls (Andrew Chow)
65833a74076cddf986037c6eb3b29a9b9dbe31c5 Add OutputType and CPubKey parameters to KeepDestination (Andrew Chow)
9fcf8ce7ae02bf170b9bf0c2887fd709d752cbf7 Rename Keep/ReturnKey to Keep/ReturnDestination and remove the wrapper (Andrew Chow)
596f6460f9fd8273665c8754ccd673d93a4f25f0 Key pool: Move CanGetAddresses call (Andrew Chow)
Pull request description:
* The `pwallet->CanGetAddresses()` call in `ReserveDestination::GetReservedDestination` to `LegacyScriptPubKeyMan::GetReservedDestination` so that the sanity check results in a failure when a `ScriptPubKeyMan` individually cannot get a destination, not when any of the `ScriptPubKeyMan`s can't.
* `ScriptPubKeyMan::GetReservedDestination` is changed to return the destination so that future `ScriptPubKeyMan`s can return destinations constructed in other ways. This is implemented for `LegacyScriptPubKeyMan` by moving key-to-destination code from `CWallet` to `LegacyScriptPubKeyMan`
* In order for `ScriptPubKeyMan` to be generic and work with future `ScriptPubKeyMan`s, `ScriptPubKeyMan::ReturnDestination` is changed to take a `CTxDestination` instead of a `CPubKey`. Since `LegacyScriptPubKeyMan` still deals with keys internally, a new map `m_reserved_key_to_index` is added in order to track the keypool indexes that have been reserved.
* A bug is fixed in how the total keypool size is calculated as it was omitting `set_pre_split_keypool` which is a bug.
Split from #17261
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Depends on D7690
Backport of Core PR17373