refactor: Restructure project, enhance ActionField and DTOField generation

This commit refactors the project structure by moving generator-related classes
to a new package (`com.sdk.generators.actionmodels`) and standardizing
template directory names (`src/main/resources/templates`).

It introduces new FreeMarker templates (`actionDTO.ftl`, `actionDTO.extend.ftl`)
and corresponding logic in `GeneratorServices.java` to support the generation
of Data Transfer Object (DTO) classes alongside ActionBeans. The changes
also involve enhancements related to `ActionField` and `DTOField` generation.

Updates to `build.gradle.kts`, `plugin.xml`, and Gradle wrapper files
reflect these structural and functional enhancements.

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.0.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists