Query: Fixes DllNotFoundException when running on Windows/x64

[ealsur]

Problem

This PR changes the behavior of the SDK on Windows/x64 scenarios when the ServiceInterop.dll is not available.

Currently when it is not available, we throw:

Unhandled exception. System.DllNotFoundException: Unable to load DLL 'Microsoft.Azure.Cosmos.ServiceInterop.dll' or one of its dependencies: The specified module could not be found. (0x8007007E)
   at Microsoft.Azure.Documents.ServiceInteropWrapper.CreateServiceProvider(String configJsonString, IntPtr& serviceProvider)
   at Microsoft.Azure.Cosmos.Query.Core.QueryPlan.QueryPartitionProvider.Initialize()
   at Microsoft.Azure.Cosmos.Query.Core.QueryPlan.QueryPartitionProvider.TryGetPartitionedQueryExecutionInfoInternal(String querySpecJsonString, PartitionKeyDefinition partitionKeyDefinition, Boolean requireFormattableOrderByQuery, Boolean isContinuationExpected, Boolean allowNonValueAggregateQuery, Boolean hasLogicalPartitionKey, Boolean allowDCount)
   at Microsoft.Azure.Cosmos.Query.Core.QueryPlan.QueryPartitionProvider.TryGetPartitionedQueryExecutionInfo(String querySpecJsonString, PartitionKeyDefinition partitionKeyDefinition, Boolean requireFormattableOrderByQuery, Boolean isContinuationExpected, Boolean allowNonValueAggregateQuery, Boolean hasLogicalPartitionKey, Boolean allowDCount)
   at Microsoft.Azure.Cosmos.CosmosQueryClientCore.TryGetPartitionedQueryExecutionInfoAsync(SqlQuerySpec sqlQuerySpec, ResourceType resourceType, PartitionKeyDefinition partitionKeyDefinition, Boolean requireFormattableOrderByQuery, Boolean isContinuationExpected, Boolean allowNonValueAggregateQuery, Boolean hasLogicalPartitionKey, Boolean allowDCount, CancellationToken cancellationToken)
   at Microsoft.Azure.Cosmos.Query.Core.QueryPlan.QueryPlanHandler.TryGetQueryPlanAsync(SqlQuerySpec sqlQuerySpec, ResourceType resourceType, PartitionKeyDefinition partitionKeyDefinition, QueryFeatures supportedQueryFeatures, Boolean hasLogicalPartitionKey, CancellationToken cancellationToken)
   at Microsoft.Azure.Cosmos.Query.Core.QueryPlan.QueryPlanRetriever.GetQueryPlanWithServiceInteropAsync(CosmosQueryClient queryClient, SqlQuerySpec sqlQuerySpec, ResourceType resourceType, PartitionKeyDefinition partitionKeyDefinition, Boolean hasLogicalPartitionKey, ITrace trace, CancellationToken cancellationToken)
   at Microsoft.Azure.Cosmos.Query.Core.ExecutionContext.CosmosQueryExecutionContextFactory.TryCreateCoreContextAsync(DocumentContainer documentContainer, CosmosQueryContext cosmosQueryContext, InputParameters inputParameters, ITrace trace, CancellationToken cancellationToken)

Customers can only fix this by correctly placing the ServiceInterop.dll and its dependencies, on the expected folder (same as SDK DLL).

There are however, some customers for which this is impossible due to deployment constraints (for example, they cannot deploy or pack native DLLs like ServiceInterop).

Proposed solution

This is one of the proposed solutions in #3225 - Automatic fallback.

The SDK will now automatically fallback to Gateway mode if the DLLs are not available on Windows x64.

This obviously poses a latency/performance issue for the user.

This PR adds this information on the diagnostics:

{
	"name": "Gateway QueryPlan",
	"id": "1ffd15dd-6d0f-418d-93e6-9fbbd0d75065",
	"start time": "09:36:54:025",
	"duration in milliseconds": 27.1973,
	"data": {
		"ServiceInterop unavailable": "True"
	}
},

Which with the right documentation enables users (and automation) to detect the case and understand how to mitigate it (copy the DLLs) if possible. If they can't, they are not broken, but know what is the reason.

Closing issues

Closes #3225
Closes #2366