feat: improve HTTP Error (#372)

- Export error so clients can catch it
- Add localized description for better print statements

Author: leoMehlig

Sources/PostgREST/PostgrestClient.swift

@@ -3,6 +3,7 @@ import ConcurrencyExtras
 import Foundation
 
 public typealias PostgrestError = _Helpers.PostgrestError
+public typealias HTTPError = _Helpers.HTTPError
 public typealias AnyJSON = _Helpers.AnyJSON
 
 #if canImport(FoundationNetworking)

Sources/_Helpers/SharedModels/HTTPError.swift

@@ -23,3 +23,13 @@ public struct HTTPError: Error, Sendable {
     self.response = response
   }
 }
+
+extension HTTPError: LocalizedError {
+  public var errorDescription: String? {
+      var message = "Status Code: \(self.response.statusCode)"
+      if let body = String(data: data, encoding: .utf8) {
+          message += " Body: \(body)"
+      }
+      return message
+  }
+}