Increase combiner request batch size

[aomerk]

Changes:

• Starts using fragments to reduce request footprint (see example request below)
• increases batch size to 50. this seems to work well running locally against production public API. It'll retry with half the batch size in worst case scenario
• Removed internal server error handler. Since the alert fetcher retries on all errors, needs unnecessary complexity

Improved query example:

fragment alertDetails on Alert {
    alertId
    addresses
    contracts {
        name
        projectId
    }
    createdAt
    description
    hash
    metadata
    name
    projects {
        id
    }
    protocol
    scanNodeCount
    severity
    source {
        transactionHash
        bot {
            chainIds
            createdAt
            description
            developer
            docReference
            enabled
            id
            image
            name
            reference
            repository
            projects
            scanNodes
            version
        }
        block {
            number
            hash
            timestamp
            chainId
        }
        sourceAlert {
            hash
            botId
            timestamp
            chainId
        }
    }
    alertDocumentType
    findingType
    relatedAlerts
    chainId
    labels {
        label
        confidence
        entity
        entityType
        remove
        metadata
        uniqueKey
        embedding
    }
    addressBloomFilter {
        bitset
        itemCount
        k
        m
    }
}

query getAlerts($input0: AlertsInput,$input1: AlertsInput,$input2: AlertsInput) {
    alerts0: alerts(input: $input0) { pageInfo { hasNextPage endCursor { alertId blockNumber } } alerts {...alertDetails}}
    alerts1: alerts(input: $input1) { pageInfo { hasNextPage endCursor { alertId blockNumber } } alerts {...alertDetails} }
    alerts2: alerts(input: $input2) { pageInfo { hasNextPage endCursor { alertId blockNumber } } alerts {...alertDetails} }
}