Refactor I&A signer modules to reduce API surface (#4403)

* Refactor signer modules

* Update builders, remove redundant interfaces

* Address comments about UX with errors

Author: haydenbaker

core/http-auth-aws-crt/pom.xml

@@ -39,53 +39,12 @@
             <artifactId>annotations</artifactId>
             <version>${awsjavasdk.version}</version>
         </dependency>
-        <dependency>
-            <groupId>software.amazon.awssdk</groupId>
-            <artifactId>http-auth-spi</artifactId>
-            <version>${awsjavasdk.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>software.amazon.awssdk</groupId>
-            <artifactId>identity-spi</artifactId>
-            <version>${awsjavasdk.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>software.amazon.awssdk</groupId>
-            <artifactId>http-auth-aws</artifactId>
-            <version>${awsjavasdk.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>software.amazon.awssdk</groupId>
-            <artifactId>http-client-spi</artifactId>
-            <version>${awsjavasdk.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>software.amazon.awssdk</groupId>
-            <artifactId>utils</artifactId>
-            <version>${awsjavasdk.version}</version>
-        </dependency>
         <dependency>
             <groupId>software.amazon.awssdk.crt</groupId>
             <artifactId>aws-crt</artifactId>
             <version>${awscrt.version}</version>
         </dependency>
 
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-core</artifactId>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter</artifactId>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <scope>test</scope>
-        </dependency>
-
     </dependencies>
 
     <build>

core/http-auth-aws-crt/src/main/java/software/amazon/awssdk/http/auth/aws/crt/HttpAuthAwsCrt.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package software.amazon.awssdk.http.auth.aws.crt;
+
+import software.amazon.awssdk.annotations.SdkProtectedApi;
+
+/**
+ * This is a place-holder class for this module, http-auth-aws-crt. In the event that we decide to move CRT-v4a signer
+ * logic back to this dedicated module, no issues will arise. This module should be an optional dependency in consumers
+ * (http-auth-aws), and should bring in the required dependencies (aws-crt).
+ */
+@SdkProtectedApi
+public class HttpAuthAwsCrt {
+}