Temporarily restore the Required option class

[alexander-yevsyukov]

This PR restores the Required option class and its parents because the class is used by CoreJvm for obtaining the value of the (required) option which could be possibly set to false on an entity state ID field.

The need for the Required option was discovered during migration of Compiler to new Validation along with other dependencies in this PR.

Once CoreJvm is updated to avoid using (now deprecated) class, the deprecated code will be removed.

It was locally tested that the patch to Validation works with the updated Compiler code.

[Copilot]

Pull request overview

Restores the deprecated runtime validation option types (notably (required)) to unblock CoreJvm usage during migration, while bumping the snapshot version and regenerating dependency reports.

Changes:

• Reintroduced runtime option classes: Required, AlwaysRequired, and their shared abstractions.
• Bumped project version from 2.0.0-SNAPSHOT.402 to 2.0.0-SNAPSHOT.403.
• Updated generated dependency report and submodule pointer.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
version.gradle.kts	Bumps validationVersion to the next snapshot.
pom.xml	Aligns Maven project version with the new snapshot.
jvm-runtime/src/main/java/io/spine/validation/option/ValidatingOption.java	Restores the common interface for runtime validating options.
jvm-runtime/src/main/java/io/spine/validation/option/FieldValidatingOption.java	Restores the abstract base for field-level validating options.
jvm-runtime/src/main/java/io/spine/validation/option/Required.java	Restores (required) option behavior and usage warnings.
jvm-runtime/src/main/java/io/spine/validation/option/AlwaysRequired.java	Adds “strict” required behavior (always validate).
dependencies.md	Regenerates dependency/license report for the new snapshot.
config	Updates the config submodule commit reference.

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[armiol]

@alexander-yevsyukov LGTM. While it shouldn't really matter due to a short lifespan of the respective piece, the comment from Copilot (see my response to it) seems worth time.