feat: add jpms support with `module-info.java`

[sgammon]

Summary

This PR adds a module-info.java definition, bringing kotlinx-collections-immutable to full JPMS support; downstream users can use the new module with the following directive:

module-info.java

module your.module.here {
  requires kotlinx.collections.immutable;
}

Fixes and closes #157

Other changes

In general, the build was cleaned up, and Dependency Locking and Dependency Verification are now turned on, as is the case for other Kotlin projects.

Trying it out

This is still a draft because it is being tested downstream. If you would like to test this module, you can do so with:

build.gradle.kts

dependencies {
  implementation("org.jetbrains.kotlinx:kotlinx-collections-immutable:0.3.8-rc-1")
}

settings.gradle.kts

dependencyResolutionManagement {
  repositories {
    mavenCentral()

    // 👇  this repo
    maven {
      name = "elide-snapshots"
      url = uri("https://elide-snapshots.storage-download.googleapis.com/repository/v3/")
    }
  }
}

Changelog

• feat: add module-info.java
• feat: add Java9Modularity used by other kotlinx projects
• feat: build core project as multi-release jar
• chore: upgrade gradle → 8.6 (to run under jvm21)
• chore: upgrade kotlin → 1.9.22
• chore: general build cleanup (use kotlin for most build scripts)
• chore: add gradle lockfiles and locking config
• chore: add gradle dependency verification config

[sgammon]

cc / @qurbonzoda @daniel-jasinski @Sporking @qwwdfsad

[daniel-jasinski]

Good PR, but there is a lot of housekeeping and the original intention gets lost in all the minutiae. I would suggest splitting this PR, at least into the chore and feature parts.

[sgammon]

@daniel-jasinski Thank you for that review

@ilya-g Okay, no problem. I will apply those changes. Thank you as well

[rfcom]

Is there still any progress on this issue?

[fzhinkin]

@sgammon do you plan continue working on this PR?