Create a tool to get the metadata for the entity

Problem/Motivation

When working with content entities, it is often necessary to determine the bundle (e.g., content type for nodes, vocabulary for taxonomy terms) before performing further operations. Currently, there is no dedicated tool to retrieve just the bundle - users must load field values or inspect the entity manually (or in the prompt if using AI).

Proposed resolution

New tool plugin: EntityBundle

Input

The tool supports two input modes:

• Loaded entity - pass an entity object directly (e.g., from a
  previous tool's output)
• Entity type ID + Entity ID - pass entity_type_id and entity_id as a fallback when no loaded entity is available

Output

• bundle (string) — the bundle machine name of the entity

Remaining tasks

MR and review