Add query plan diagnostics and refactor query diagnostics

[j82w]

Pull Request Template

Description

1. Added query plan diagnostics. This shows if the query was created from a continuation token, gateway (includes all pipeline info), or the service interop.
2. The diagnostics are now using the query context and client to get and store the information. This removes the need for the query pipeline to aggregate the information.
3. Removed SchedulingTimeSpan as it is duplicate information.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Example of the first page with pipeline diagnostics.

{
    "Summary": {
        "StartUtc": "2020-03-18T21:08:44.8969049Z",
        "TotalElapsedTime": "00:00:00.0042679",
        "UserAgent": "cosmos-netstandard-sdk/3.7.0|3.7.1|83761|X64|Microsoft Windows 10.0.18363 |.NET Core 4.6.28325.01|",
        "TotalRequestCount": 1,
        "FailedRequestCount": 0
    },
    "Context": [
        {
            "Id": "CreateQueryPipeline",
            "ElapsedTime": "00:00:00.0004811"
        },
        {
            "Id": "ServiceInterop",
            "ElapsedTime": "00:00:00.0002203"
        },
        {
            "PKRangeId": "0",
            "StartUtc": "2020-03-18T21:08:44.8974106Z",
            "QueryMetric": "totalExecutionTimeInMs=0.36;queryCompileTimeInMs=0.05;queryLogicalPlanBuildTimeInMs=0.02;queryPhysicalPlanBuildTimeInMs=0.03;queryOptimizationTimeInMs=0.00;VMExecutionTimeInMs=0.10;indexLookupTimeInMs=0.00;documentLoadTimeInMs=0.03;systemFunctionExecuteTimeInMs=0.00;userFunctionExecuteTimeInMs=0.00;retrievedDocumentCount=1;retrievedDocumentSize=679;outputDocumentCount=1;outputDocumentSize=728;writeOutputTimeInMs=0.00;indexUtilizationRatio=1.00",
            "IndexUtilization": "",
            "Context": [
                {
                    "Id": "AggregatedClientSideRequestStatistics",
                    "ContactedReplicas": [],
                    "RegionsContacted": [
                        "https://127.0.0.1:8081/"
                    ],
                    "FailedReplicas": []
                },
                {
                    "Id": "Microsoft.Azure.Cosmos.Handlers.RetryHandler",
                    "ElapsedTime": "00:00:00.0026608"
                },
                {
                    "Id": "Microsoft.Azure.Cosmos.Handlers.RouterHandler",
                    "ElapsedTime": "00:00:00.0026448"
                },
                {
                    "Id": "TransportHandler",
                    "ElapsedTime": "00:00:00.0026399"
                },
                {
                    "Id": "StoreResponseStatistics",
                    "ResponseTimeUtc": "2020-03-18T21:08:44.8997892Z",
                    "ResourceType": "Document",
                    "OperationType": "Query",
                    "LocationEndpoint": "https://127.0.0.1:8081/",
                    "StoreResult": "StorePhysicalAddress: rntbd://127.0.0.1:10253/apps/DocDbApp/services/DocDbServer23/partitions/a4cb4963-38c8-11e6-8106-8cdcd42c33be/replicas/1p/, LSN: 268, GlobalCommittedLsn: -1, PartitionKeyRangeId: 0, IsValid: True, StatusCode: 200, SubStatusCode: 0, RequestCharge: 2.29, ItemLSN: -1, SessionToken: -1#268, UsingLocalLSN: True, TransportException: null"
                }
            ]
        }
    ]
}