feat: log context api

request -
```
{
    "stream": "teststream",
    "contextWindow": "1m",
    "pTimestamp": "2026-06-18T07:39:59.995Z",
    "pageSize": 500,
    "message": "Application started",
    "conditions": {
        "operator": "and",
        "groups": [
            {
                "operator": "or",
                "conditionConfig": [
                    {
                        "column": "level",
                        "operator": "=",
                        "value": "warn",
                        "type": "text"
                    }
                ]
            }
        ]
    }
}
```

response -
```
{
    "scope": "contextWindow",
    "contextStartTime": "2026-06-18T07:38:00Z",
    "contextEndTime": "2026-06-18T07:40:00Z",
    "limit": 500,
    "anchorIndex": 10,
    "duplicateAnchorCount": 15,
    "anchoredDuplicate": "first",
    "records": [
        {
            "app_meta": "okcequedfmkqlgzheaidrcce",
            "device_id": 126.0,
            "host": "172.162.1.120",
            "level": "warn",
            "location": "uqwetjbuvjameflh",
            "message": "Application is failing",
            "meta-containerimage": "ghcr.io/parseablehq/quest",
            "meta-containername": "log-generator",
            "meta-host": "10.116.0.3",
            "meta-namespace": "go-apasdp",
            "meta-podlabels": "app=go-app,pod-template-hash=6c87bc9cc9",
            "meta-source": "quest-test",
            "os": "Windows",
            "p_src_ip": "127.0.0.1",
            "p_timestamp": "2026-06-18T07:39:59.995",
            "p_user_agent": "Grafana k6/1.6.1",
            "request_body": "vlywlgkpmciorkiklfruxcfnzaspahyscsazpmnqgquqrtahrzhmtojwvackzcqngscesuadnupwpdsryfrvlifembjotnftzuwx",
            "session_id": "pqr",
            "source_time": "2026-06-18T07:39:59.991",
            "status_code": 500.0,
            "user_id": 98513.0,
            "uuid": "169fa593-fa27-4625-8576-1faab8b9cc71",
            "version": "1.2.0"
        }
    ],
    "queries": {
        "previous": {
            "query": "SELECT * FROM (SELECT * FROM \"teststream\" WHERE ((\"p_timestamp\" >= TIMESTAMP '2026-06-18 07:38:00.000' AND \"p_timestamp\" < TIMESTAMP '2026-06-18 07:40:00.000') AND ((\"level\" = 'warn'))) AND (\"p_timestamp\" > TIMESTAMP '2026-06-18 07:39:59.995' OR (\"p_timestamp\" = TIMESTAMP '2026-06-18 07:39:59.995' AND \"message\" < 'Application is failing')) ORDER BY \"p_timestamp\" ASC, \"message\" DESC LIMIT 500) AS log_context_seek_page ORDER BY \"p_timestamp\" DESC, \"message\" ASC",
            "startTime": "2026-06-18T07:38:00Z",
            "endTime": "2026-06-18T07:40:00Z",
            "sendNull": false
        },
        "next": {
            "query": "SELECT * FROM \"teststream\" WHERE ((\"p_timestamp\" >= TIMESTAMP '2026-06-18 07:38:00.000' AND \"p_timestamp\" < TIMESTAMP '2026-06-18 07:40:00.000') AND ((\"level\" = 'warn'))) AND (\"p_timestamp\" < TIMESTAMP '2026-06-18 07:39:59.662' OR (\"p_timestamp\" = TIMESTAMP '2026-06-18 07:39:59.662' AND \"message\" > 'Logging a request')) ORDER BY \"p_timestamp\" DESC, \"message\" ASC LIMIT 500",
            "startTime": "2026-06-18T07:38:00Z",
            "endTime": "2026-06-18T07:40:00Z",
            "sendNull": false
        }
    }
}
```

Author: nikhilsinhaparseable