refactor: group codegen modules (#792)

Author: aajtodd

README.md

@@ -25,7 +25,7 @@ val jsoupVersion: String by project
 dependencies {
     implementation(kotlin("stdlib-jdk8"))
     implementation("software.amazon.smithy:smithy-aws-traits:$smithyVersion")
-    api(project(":smithy-kotlin-codegen"))
+    api(project(":codegen:smithy-kotlin-codegen"))
 
     // Test dependencies
     implementation("org.junit.jupiter:junit-jupiter:$junitVersion")

smithy-kotlin-codegen-testutils/build.gradle.kts renamed to codegen/smithy-kotlin-codegen-testutils/build.gradle.kts

@@ -36,7 +36,7 @@ dependencies {
     testImplementation("io.kotest:kotest-assertions-core-jvm:$kotestVersion")
     testImplementation("org.jetbrains.kotlin:kotlin-test:$kotlinVersion")
     testImplementation("org.jetbrains.kotlin:kotlin-test-junit5:$kotlinVersion")
-    testImplementation(project(":smithy-kotlin-codegen-testutils"))
+    testImplementation(project(":codegen:smithy-kotlin-codegen-testutils"))
 }
 
 val generateSdkRuntimeVersion by tasks.registering {