fix(RenderDebugOverlayPlugin): Require the bevy_pbr feature for inclusion in DefaultPlugins

[kfc35]

Objective

• Fixes bevy_dev_tools causes crash #23673
• The RenderDebugOverlayPlugin is a DefaultPlugin that currently only requires the bevy_dev_tools feature. However, under the hood in its init_render_debug_overlay_pipeline system, it requires the MeshPipelineViewLayouts resource to be initialized. The resource is initialized in the MeshRenderPlugin (system init_mesh_pipeline_view_layouts). The MeshRenderPlugin is part of the PbrPlugin, which is a plugin in DefaultPlugins that requires the bevy_pbr feature. This causes an error when you have a bevy project with DefaultPlugins, without default features, and have the bevy_dev_tools feature enabled.

Solution

• The RenderDebugOverlayPlugin additionally requires the bevy_pbr feature so that it can be included in DefaultPlugins. This ensures MeshPipelineViewLayouts is initialized so that RenderDebugOverlayPlugin can properly initialize.
• If RenderDebugOverlayPlugin can be more dexterously changed to still be enabled with just the bevy_dev_tools feature, and bevy_pbr specific logic can be handled within the plugin itself, then this can PR can be rejected.

Testing

• I created a scratch bevy project with the configuration described in the linked issue, but pointing to this branch fix for its bevy dependency. It successfully runs.