Merge #19133: rpc, cli, test: add bitcoin-cli -generate command

22cb303cf099b430d602384bc92706ce01b4f98d rpc: add missing space in JSON parsing error message, update test (Jon Atack)
bf53ebef061a563cfc4c5857f5d6bc93fb136282 test: add multiwallet tests for bitcoin-cli -generate (Jon Atack)
4b859cfff9965eb07044f4d104398cb0e7ab127e cli: add multiwallet capability to GetNewAddress and -generate (Jon Atack)
18f93545a12db00180cea369a4b5cce7f10cd362 test: add tests for bitcoin-cli -generate (Jon Atack)
4818124137732540383a29835afa2be41aa55ca8 cli: create bitcoin-cli -generate command (Jon Atack)
ff41a3690066081772b172f3c31a63f5fe6ea7ed cli: extract ParseResult() and ParseError() (Jon Atack)
f4185b26d9b2ff2e86c99cdfe3ad9be62bb6299a cli: create GenerateToAddressRequestHandler class (Harris)
f7c65a33508c4bb8e9ed896e150a4fa529a243e5 cli: create GetNewAddress() (Jon Atack)
9be7fd35c5d631c2cc34d3b4fa63ae0a9d5a68ef rpc: make generatetoaddress locals const (Jon Atack)
cb00510dbac99b44f3f2cf6e58bb2e4401c5ef28 rpc: create rpc/mining.h, hoist default max tries values to constant (Jon Atack)

Pull request description:

  This PR continues and completes the work begun in #17700 working on issue #16000 to create a client-side version of RPC `generate`.

  Basically, `bitcoin-cli -generate` wraps calling `generatenewaddress` followed by `generatetoaddress [nblocks] [maxtries]` and prints the following:

  ```
  $ bitcoin-cli -generate
  {
    "address": "bcrt1qn4aszr2y2xvpa70y675a76wsu70wlkwvdyyln6"
    "blocks": [
      "01d2ebcddf663da90b28da7f6805115e2ba7818f16fe747258836646a43a0bb5",
    ]
  }

  $ bitcoin-cli -rpcwallet=wallet-name -generate 3 100
  {
    "address": "bcrt1q4cunfw0gnsj7g7e6mk0v0uuvvau9mwr09dj45l",
    "blocks": [
      "7a6650ca5e0c614992ee64fb148a7e5e022af842e4b6003f81abd8baf1e75136",
      "01d2ebcddf663da90b28da7f6805115e2ba7818f16fe747258836646a43a0bb5",
      "3f8795ec40b1ad812b818c177680841be319a3f6753d4e32dc7dfb5bafe5d00e"
    ]
  }
  ```

  Help doc:
  ```
  $ bitcoin-cli -h | grep -A5 "\-generate"
    -generate
         Generate blocks immediately, equivalent to RPC generatenewaddress
         followed by RPC generatetoaddress. Optional positional arguments
         are number of blocks to generate (default: 1) and maximum
         iterations to try (default: 1000000), equivalent to RPC
         generatetoaddress nblocks and maxtries arguments. Example:
         bitcoin-cli -generate 4 1000
  ```

  Quite a bit of test coverage turned out to be needed to cover the change and the different cases (arguments, multiwallet mode) and error-handling.

  This PR also improves some things that working on these changes brought to light.

  Credit to Harris Brakmić for the initial work in #17700.

ACKs for top commit:
  adamjonas:
    utACK 22cb303cf099b430d602384bc92706ce01b4f98d
  meshcollider:
    utACK 22cb303cf099b430d602384bc92706ce01b4f98d

Tree-SHA512: 94f67f632fe093d076f614e0ecff09ce7342ac6e424579200d5211a6615260e438d857861767fb788950ec6da0b26ef56dc8268c430012a3b3d4822b24ca6fbf

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