Allow to specify max-active-requests-per-client for each Client instance #1137
Description
Brief feature description
The current config for request-response services allows to specify the max-active-requests-per-client. This config is currently used for all clients of a service but different clients could have different requirements on the number of active requests. So it should be possible to specify this config value for each Client instance independently.
Similar as it is done for server-max-loaned-responses-per-request