### Godot version

4.2.dev 80de898d721f952dac0b102d48bb73d6b02ee1e8

### System information

OpenXR

### Issue description

The Godot 3 OpenXR plugin supported obtaining boundary/guardian information in order to obtain play space logic. While we do have a function in the `XRInterface` in Godot 4 that is supposed to retrieve this information (`get_play_area`) it is not implemented on the Godot 4 `OpenXRInterface`.

This logic needs to be ported.

### Steps to reproduce

Call `get_play_area`, be amazed by it not returning data :P

### Minimal reproduction project

Any XR project.
bool is_reference_space_supported(XrReferenceSpaceType p_reference_space);
	bool setup_spaces();
	bool load_supported_swapchain_formats();
	bool is_swapchain_format_supported(int64_t p_swapchain_format);
	bool create_swapchains();
	void destroy_session();
	
	bool create_swapchain(XrSwapchainUsageFlags p_usage_flags, int64_t p_swapchain_format, uint32_t p_width, uint32_t p_height, uint32_t p_sample_count, uint32_t p_array_size, XrSwapchain &r_swapchain, void **r_swapchain_graphics_data);
	bool acquire_image(OpenXRSwapChainInfo &p_swapchain);
	bool release_image(OpenXRSwapChainInfo &p_swapchain);
	
	struct Tracker { 
		String name; 
		XrPath toplevel_path; 
		RID active_profile_rid; 
	};
	RID_Owner<Tracker, true> tracker_owner;
	RID get_tracker_rid(XrPath p_path);
	struct ActionSet { 
		String name; 
		bool is_attached; 
		XrActionSet handle; 
	};
	RID_Owner<ActionSet, true> action_set_owner;
	struct ActionTracker { 
		RID tracker_rid; 
		XrSpace space; 
		bool was_location_valid; 
	};
	struct Action {