[improve][broker]add active status into cursor stats

[HQebupt]

Motivation

The active state indicates whether a cursor is active. And it affects the cache hit rate, because inactive cursors will be evicted from the entry cache. This active state helps to troubleshoot issues with low cache hit rate.
Also it is meaningful for configuring a suitable values for managedLedgerCursorBackloggedThreshold in ServiceConfiguration

# Configure the threshold (in number of entries) from where a cursor should be considered 'backlogged'
# and thus should be set as inactive.
managedLedgerCursorBackloggedThreshold=1000

Modifications

Add active status into cursor stats.
It will get the following sample data when getting the internalStats of a partitioned topic.

{
    "entriesAddedCounter": 6,
    "numberOfEntries": 10302152,
    "totalSize": 63786554161,
    "currentLedgerEntries": 6,
    "currentLedgerSize": 31182,
    "lastLedgerCreatedTimestamp": "2022-09-29T14:48:52.825+08:00",
    "waitingCursorsCount": 0,
    "pendingAddEntriesCount": 0,
    "lastConfirmedEntry": "1359228:5",
    "lastIndex": 1165055506,
    "state": "LedgerOpened",
    "ledgers": [
        {
            "ledgerId": 1356881,
            "entries": 50000,
            "size": 309705120,
            "offloaded": false,
            "underReplicated": false
        }
    ],
    "cursors": {
        "cg_test_map_cache1": {
            "markDeletePosition": "1356881:3399",
            "readPosition": "1356881:3400",
            "waitingReadOp": false,
            "pendingReadOps": 0,
            "messagesConsumedCounter": -10298746,
            "cursorLedger": -1,
            "cursorLedgerLastEntry": -1,
            "individuallyDeletedMessages": "[]",
            "lastLedgerSwitchTimestamp": "2022-09-29T14:48:52.859+08:00",
            "state": "NoLedger",
            "numberOfEntriesSinceFirstNotAckedMessage": 1,
            "totalNonContiguousDeletedMessagesRange": 0,
            "subscriptionHavePendingRead": false,
            "subscriptionHavePendingReplayRead": false,
            "active": false,
            "properties": {
                "index": 846056487
            }
        },
        "cg_test_map_cache2": {
            "markDeletePosition": "1359208:79",
            "readPosition": "1359228:6",
            "waitingReadOp": false,
            "pendingReadOps": 0,
            "messagesConsumedCounter": -8,
            "cursorLedger": 1359234,
            "cursorLedgerLastEntry": 1,
            "individuallyDeletedMessages": "[]",
            "lastLedgerSwitchTimestamp": "2022-09-29T14:48:52.859+08:00",
            "state": "Open",
            "numberOfEntriesSinceFirstNotAckedMessage": 15,
            "totalNonContiguousDeletedMessagesRange": 0,
            "subscriptionHavePendingRead": false,
            "subscriptionHavePendingReplayRead": false,
            "active": true,
            "properties": {
                "index": 1165055008
            }
        }
    },
    "schemaLedgers": [],
    "compactedLedger": {
        "ledgerId": -1,
        "entries": -1,
        "size": -1,
        "offloaded": false,
        "underReplicated": false
    }
}

Verifying this change

• Make sure that the change passes the CI checks.

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)
• The rest endpoints: (no)
• The admin cli options: (no)
• Anything that affects deployment: (no)

Documentation

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• doc-complete

Matching PR in forked repository

PR in forked repository: HQebupt#1

[HQebupt]

@AnonHxy @codelipenghui @Jason918 @Technoboy- @mattisonchao PTAL thanks. The matching PR pass the tests.

[AnonHxy]

LGTM

[HQebupt]

/pulsarbot ready-to-test

[HQebupt]

/pulsarbot run-failure-checks

[HQebupt]

/pulsarbot run-failure-checks