feat: add isStreaming function and additional comment strings (#784)

Author: dayaffe

Sources/SmithyHTTPAPI/HTTPResponse.swift

@@ -46,6 +46,23 @@ public class HTTPResponse: HTTPURLResponse, ResponseMessage {
         self._statusCode = statusCode
         self.headers = headers
     }
+
+    /**
+     * Replace the response body
+     */
+    public func copy(
+        headers: Headers? = nil,
+        body: ByteStream? = nil,
+        statusCode: HTTPStatusCode? = nil,
+        reason: String? = nil
+    ) -> HTTPResponse {
+        return HTTPResponse(
+            headers: headers ?? self.headers,
+            body: body ?? self.body,
+            statusCode: statusCode ?? self.statusCode,
+            reason: reason ?? self.reason
+        )
+    }
 }
 
 extension HTTPResponse: CustomDebugStringConvertible {

smithy-swift-codegen/src/main/kotlin/software/amazon/smithy/swift/codegen/model/ShapeExt.kt

@@ -63,15 +63,30 @@ fun ServiceShape.hasIdempotentTokenMember(model: Model) =
 val Shape.isDeprecated: Boolean
     get() = hasTrait<DeprecatedTrait>()
 
+/**
+ * Test if a shape represents a string enumeration shape
+ */
 val Shape.isEnum: Boolean
     get() = isStringShape && hasTrait<EnumTrait>()
 
+/**
+ * Test if a shape is an error.
+ */
 val Shape.isError: Boolean
     get() = hasTrait<ErrorTrait>()
 
+/**
+ * Test if a shape represents a Kotlin number type
+ */
 val Shape.isNumberShape: Boolean
     get() = this is NumberShape
 
+/**
+ * Test if a shape has the streaming trait applied.
+ */
+val Shape.isStreaming: Boolean
+    get() = hasTrait<StreamingTrait>()
+
 fun Shape.toUpperCamelCase(): String {
     return this.id.name.toUpperCamelCase()
 }