fix(RetryableHost): Make the RetryableHost initializer public (#747)

Author: VladislavFitz

Sources/AlgoliaSearchClient/Transport/RetryStrategy/RetryableHost.swift

@@ -16,6 +16,10 @@ public struct RetryableHost {
   var isUp: Bool
   var lastUpdated: Date
   var retryCount: Int
+  
+  public init(url: URL) {
+    self.init(url: url, callType: .universal)
+  }
 
   init(url: URL, callType: CallTypeSupport = .universal) {
     self.url = url