Make Gateway's satellite concurrency configurable

[timbussmann]

The Gateway adds a custom satellite using PushRuntimeSettings.Default as the concurrency setting:

NServiceBus.Gateway/src/NServiceBus.Gateway/Gateway.cs

Line 73 in 29ba3a4

context.AddSatelliteReceiver("Gateway", gatewayInputAddress, requiredTransactionSupport, PushRuntimeSettings.Default,

. With Particular/NServiceBus#4213 the satellites no longer use the value configured by the user on LimitMessageProcessingConcurrencyTo.

Do we need to make the satellite's queue concurrency settings configurable?

[bording]

I would say yes, we should make this configurable.