Add Gradle build system support

[Copilot]

Adds Gradle as an alternative build system alongside Maven. Infrastructure is complete; module-specific dependency migration remains optional.

Core Infrastructure

• Gradle wrapper 8.12 (gradlew, gradlew.bat)
• Root build config (build.gradle.kts) - Kotlin 2.2.20, Spring Boot 3.3.8, Java 17 target
• Multi-project structure (settings.gradle.kts) - all 38 modules defined
• Version catalog (gradle/libs.versions.toml) - centralized dependency management for 30+ libraries

Configuration

// Root build applies to all subprojects
subprojects {
    apply(plugin = "org.jetbrains.kotlin.jvm")
    
    tasks.withType<KotlinCompile> {
        compilerOptions {
            freeCompilerArgs.addAll("-Xjsr305=strict", "-Xjvm-default=all")
            jvmTarget.set(JvmTarget.JVM_17)
        }
    }
    
    dependencies {
        implementation(platform("org.jetbrains.kotlin:kotlin-bom:2.2.20"))
        implementation("org.jetbrains.kotlin:kotlin-stdlib")
        // Common deps auto-applied
    }
}

Module Migration Template

Example for pulsar-core/pulsar-common/build.gradle.kts:

dependencies {
    implementation(rootProject.libs.spring.core)
    implementation(rootProject.libs.guava)
    implementation(rootProject.libs.httpclient5)
    // Map from pom.xml as needed
}

Documentation

• GRADLE.md - usage guide, migration patterns, troubleshooting
• Updated READMEs with dual build system commands
• docs/development/build.md - comparison of Maven vs Gradle workflows

Status

Working: Infrastructure complete, all 38 modules recognized, publishing configured
Pending: Individual module build.gradle.kts files (templates provided)

Both build systems coexist - Maven remains primary and fully functional.

Original prompt

为项目增加gradle支持

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