Merge #15761: Replace -upgradewallet startup option with upgradewallet RPC

0d32d661481f099af572e7a08a50e17bcc165c44 Remove -upgradewallet startup option (Andrew Chow)
92263cce5b6c6b66296dadda5f29724611db0160 Add upgradewallet RPC (Andrew Chow)
1e48796c99b63aa8fa8451ce7b0c20759ea43500 Make UpgradeWallet a member function of CWallet (Andrew Chow)
c988f27937bc79c90f4eed48552c72f1b66dc044 Have UpgradeWallet take the version to upgrade to and an error message out parameter (Andrew Chow)
183323712398e26ddcf3a9dc048aaa9900a91f5a Only run UpgradeWallet if the wallet needs to be upgraded (Andrew Chow)
9c16b1735f8e530ce68d678e9ca0eceb2ceb3520 Move wallet upgrading to its own function (Andrew Chow)

Pull request description:

  `-upgradewallet` is largely incompatible with many recent wallet features and versions. For example, it was disabled if multiple wallets were used and would not work with encrypted wallets that were being upgraded to HD.

  This PR does away with the old method of upgrading upon startup and instead allows users to upgrade their wallets via an `upgradewallet` RPC. This does largely the same thing as the old `-upgradewallet` option but because the wallet is loaded, it can be unlocked to upgrade to HD. Furthermore it is compatible with multiwallet as it works on the individual wallet that is specified by the RPC.

ACKs for top commit:
  meshcollider:
    Code review ACK 0d32d661481f099af572e7a08a50e17bcc165c44
  darosior:
    ACK 0d32d661481f099af572e7a08a50e17bcc165c44
  MarcoFalke:
    ACK 0d32d661481f099af572e7a08a50e17bcc165c44 🚵

Tree-SHA512: b425bf6f5d605e26506889d63c780895482f07cbc086193218e031e8504d3072d41e90d65cd41bcc98ee4c1eb048954bc5d4ac85435f7394892373aac89a3b0a

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