Add support for fetch.wait.max.ms Kafka consumer config (#197)

Motivation:

Currently the API doesn't provide a way to set the `fetch.wait.max.ms`
Kafka consumer config. This PR enables the user to set it.

Modifications:

Added support for `fetch.wait.max.ms` inside of
`KafkaConsumerConfiguration`.

Result:

We can set `fetch.wait.max.msa`.

Author: supersonicbyte

Sources/Kafka/Configuration/KafkaConsumerConfiguration.swift

@@ -188,6 +188,20 @@ public struct KafkaConsumerConfiguration {
         }
     }
 
+    /// The maximum amount of time the server will block before answering the fetch request
+    /// there isn’t sufficient data to immediately satisfy the requirement given by fetch.min.bytes.
+    /// Default: `.milliseconds(500)`
+    public var maximumFetchWaitTime: Duration = .milliseconds(500) {
+        didSet {
+            if maximumFetchWaitTime != .zero {
+                precondition(
+                    maximumFetchWaitTime.canBeRepresentedAsMilliseconds,
+                    "Lowest granularity is milliseconds"
+                )
+            }
+        }
+    }
+
     /// Topic metadata options.
     public var topicMetadata: KafkaConfiguration.TopicMetadataOptions = .init()
 
@@ -260,6 +274,7 @@ extension KafkaConsumerConfiguration {
         resultDict["receive.message.max.bytes"] = String(maximumReceiveMessageBytes)
         resultDict["max.in.flight.requests.per.connection"] = String(maximumInFlightRequestsPerConnection)
         resultDict["metadata.max.age.ms"] = String(maximumMetadataAge.inMilliseconds)
+        resultDict["fetch.wait.max.ms"] = String(maximumFetchWaitTime.inMilliseconds)
         resultDict["topic.metadata.refresh.interval.ms"] = String(topicMetadata.refreshInterval.rawValue)
         resultDict["topic.metadata.refresh.fast.interval.ms"] = String(topicMetadata.refreshFastInterval.inMilliseconds)
         resultDict["topic.metadata.refresh.sparse"] = String(topicMetadata.isSparseRefreshingEnabled)