Merge #16399: wallet: Improve wallet creation

e967cae8fac84ec7a89a3a853a83d8193ac3308e Use switch on status in RpcWallet (Fabian Jahr)
ba1f128d6c117a63d5d904b3956551bd83405ec9 Return error for ignored passphrase through disable private keys option (Fabian Jahr)
d6649d16b57e20b05075f1c80d0de7ff32cca1a4 Use strong enum for WalletCreationStatus (Fabian Jahr)
3199610ad3b93b849f2cb55a8ed3a39a32bbdffc Place out args at the end for CreateWallet (Fabian Jahr)

Pull request description:

  This is a follow-up PR to #16244

  The following suggestions are included:
  - Usage of `enum class` (https://github.com/bitcoin/bitcoin/pull/16244#discussion_r296434142)
  - Placing out args at the end convention (https://github.com/bitcoin/bitcoin/pull/16244#discussion_r296434172)
  - Return error when passphrase would be ignored because of disabled private keys (including functional test) (https://github.com/bitcoin/bitcoin/pull/16244#pullrequestreview-252015195)
  - Make `status` return variable of `CreateWallet` (https://github.com/bitcoin/bitcoin/pull/16244#discussion_r302107394)
  - Using a `switch` statement instead of `if/else` in `RpcWallet` (https://github.com/bitcoin/bitcoin/pull/16244#discussion_r302112502)

  Not included was:
  - "new create wallet function [could take] separate option arguments instead of wallet flags" (https://github.com/bitcoin/bitcoin/pull/16244#pullrequestreview-252015195)
  - "blank wallet and disable private keys options could be combined into a single option" (https://github.com/bitcoin/bitcoin/pull/16244#pullrequestreview-252015195)

  For these last two changes, I was not sure what an ideal solution could look like and/or this might be of slightly larger scope than the other changes, but I would be happy to work on these as well in this PR or another follow-up if I get positive feedback on that. Is there a place in the codebase that handles flags like these in a better way that I can refer to? Nonetheless, I would prefer keeping it in a separate PR unless it is a really simple change.

ACKs for top commit:
  jnewbery:
    Code review utACK e967cae8fac84ec7a89a3a853a83d8193ac3308e
  MarcoFalke:
    ACK e967cae8fa

Tree-SHA512: 3d12880ff95add9e4a5702afa26ef38080b57b216a608c113a4d0a08ba2d61142c027ba0071c6402add45db90383eee0bada12dc42820dc0d602721d7175edd5

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