Expose findManagedVersion as public API

[gnodet]

Summary

Make PomEditor.Dependencies.findManagedVersion(Coordinates) public so callers can check whether a dependency is already locally managed before performing mutations.

Use case

When adding a transitive dependency with addAligned using VersionStyle.MANAGED, the method always creates a local <dependencyManagement> entry — even when the dependency is already managed by a parent POM. This causes unwanted local managed entries that shadow the parent's management.

Callers need to check whether a managed entry already exists locally before calling addAligned, so they can skip or clean up the redundant local entry. Currently the only way is manual DOM navigation:

boolean hadManagedEntry = editor.document().root()
        .childElement("dependencyManagement")
        .flatMap(dm -> dm.childElement("dependencies"))
        .flatMap(deps -> deps.childElements("dependency")
                .filter(coords.predicateGATC())
                .findFirst())
        .isPresent();

Proposed API

Make the existing private method public:

public String findManagedVersion(Coordinates coords)

Returns the managed version string if found locally, or null if not.

Alternatively, a boolean hasManagedDependency(Coordinates) convenience method would also work.

Claude Code on behalf of Guillaume Nodet