Multiple pools support in query stake snapshot

[newhoggy]

Add support for querying of multiple pools. Note, this changes the JSON structure:

Query for no pools:

$ time CARDANO_NODE_SOCKET_PATH=example/main.sock cardano-cli query stake-snapshot --testnet-magic 42
{
    "pools": {}
    "total": {
        "stakeGo": 1800000000000,
        "stakeMark": 1800000000000,
        "stakeSet": 1800000000000
    }
}
CARDANO_NODE_SOCKET_PATH=example/main.sock  query stake-snapshot  42  0.01s user 0.00s system 42% cpu 0.029 total

Query for two pools:

$ time CARDANO_NODE_SOCKET_PATH=example/main.sock cardano-cli query stake-snapshot --testnet-magic 42 --stake-pool-id 0436087e6f0a3d828d4dadaf0fcbccff3a3d5a2fa8f76a015d991613 --stake-pool-id 67086804da63179eb7972e2be856a6fbbd9e3673e50fecc6efbd12f3
{
    "pools": {
        "0436087e6f0a3d828d4dadaf0fcbccff3a3d5a2fa8f76a015d991613": {
            "stakeGo": 300000000000,
            "stakeMark": 300000000000,
            "stakeSet": 300000000000
        },
        "67086804da63179eb7972e2be856a6fbbd9e3673e50fecc6efbd12f3": {
            "stakeGo": 1200000000000,
            "stakeMark": 1200000000000,
            "stakeSet": 1200000000000
        }
    },
    "total": {
        "stakeGo": 1800000000000,
        "stakeMark": 1800000000000,
        "stakeSet": 1800000000000
    }
}
CARDANO_NODE_SOCKET_PATH=example/main.sock  query stake-snapshot  42      0.01s user 0.01s system 45% cpu 0.028 total

Query for all pools:

$ time CARDANO_NODE_SOCKET_PATH=example/main.sock cardano-cli query stake-snapshot --testnet-magic 42 --all-stake-pools
{
    "pools": {
        "0436087e6f0a3d828d4dadaf0fcbccff3a3d5a2fa8f76a015d991613": {
            "stakeGo": 300000000000,
            "stakeMark": 300000000000,
            "stakeSet": 300000000000
        },
        "2b8126681160daab09f013163df264274aaa77d4a972e4067e2554b2": {
            "stakeGo": 300000000000,
            "stakeMark": 300000000000,
            "stakeSet": 300000000000
        },
        "67086804da63179eb7972e2be856a6fbbd9e3673e50fecc6efbd12f3": {
            "stakeGo": 1200000000000,
            "stakeMark": 1200000000000,
            "stakeSet": 1200000000000
        }
    },
    "total": {
        "stakeGo": 1800000000000,
        "stakeMark": 1800000000000,
        "stakeSet": 1800000000000
    }
}
CARDANO_NODE_SOCKET_PATH=example/main.sock  query stake-snapshot  42   0.01s user 0.01s system 43% cpu 0.029 total

Usage:

Usage: cardano-cli query stake-snapshot
            [ --shelley-mode
            | --byron-mode [--epoch-slots NATURAL]
            | --cardano-mode [--epoch-slots NATURAL]
            ]
            (--mainnet | --testnet-magic NATURAL)
            [--all-pools | [--stake-pool-id STAKE_POOL_ID]]

  Obtain the three stake snapshots for a pool, plus the total active stake
  (advanced command)

Available options:
  --shelley-mode           For talking to a node running in Shelley-only mode.
  --byron-mode             For talking to a node running in Byron-only mode.
  --epoch-slots NATURAL    The number of slots per epoch for the Byron era.
                           (default: 21600)
  --cardano-mode           For talking to a node running in full Cardano mode
                           (default).
  --epoch-slots NATURAL    The number of slots per epoch for the Byron era.
                           (default: 21600)
  --mainnet                Use the mainnet magic id.
  --testnet-magic NATURAL  Specify a testnet magic id.
  --all-pools              Query for all pools
  --stake-pool-id STAKE_POOL_ID
                           Stake pool ID/verification key hash (either
                           Bech32-encoded or hex-encoded). Zero or more
                           occurences of this option is allowed.
  -h,--help                Show this help text

Implements #4570

Depends on:

• Optimise query leadership schedule command #4250

[Jimbo4350]

LGTM, can you ask QA to look at it

[newhoggy]

This PR is blocked on #4250