[MCPE-178379] Double slab IDs not in parity with java, despite the splitting of IDs

With the latest preview, wooden slab IDs got split up into one for each type.
However, the way double wooden slabs were handled keeps them in disparity from java.

Back in 1.13, java edition split the wooden slab IDs, and merged the double slabs and single slabs, differentiating them by block state. Bedrock keeps the double slabs separate instead.

Java edition: oak_slab[type=double]
Bedrock edition: double_oak_slab

The same situation exists for all double slabs, not just the wooden slabs (though (double_)stone_slab is still pending split),even those added after busy bees, from which parity became a goal.

Block	Double ID	Single ID (to merge into)
Oak Slab	`double_oak_slab`	`oak_slab`
Spruce Slab	`double_spruce_slab`	`spruce_slab`
Birch Slab	`double_birch_slab`	`birch_slab`
Jungle Slab	`double_jungle_slab`	`jungle_slab`
Acacia Slab	`double_acacia_slab`	`acacia_slab`
Dark Oak Slab	`double_dark_oak_slab`	`dark_oak_slab`
Mangrove Slab	`double_mangrove_slab`	`mangrove_slab`
Cherry Slab	`double_cherry_slab`	`cherry_slab`
Bamboo Slab	`double_bamboo_slab`	`bamboo_slab`
Bamboo Mosaic Slab	`double_bamboo_mosaic_slab`	`bamboo_mosaic_slab`
Crimson Slab	`double_crimson_slab`	`crimson_slab`
Warped Slab	`double_warped_slab`	`warped_slab`
Cobbled Deepslate Slab	`cobbled_deepslate_double_slab`	`cobbled_deepslate_slab`
Polished Deepslate Slab	`polished_deepslate_double_slab`	`polished_deepslate_slab`
Deepslate Brick Slab	`deepslate_brick_double_slab`	`deepslate_brick_slab`
Deepslate Tile Slab	`deepslate_tile_double_slab`	`deepslate_tile_slab`
Tuff Slab	`tuff_double_slab`	`tuff_slab`
Polished Tuff Slab	`polished_tuff_double_slab`	`polished_tuff_slab`
Tuff Brick Slab	`tuff_brick_double_slab`	`tuff_brick_slab`
Mud Brick Slab	`mud_brick_double_slab`	`mud_brick_slab`
Blackstone Slab	`blackstone_double_slab`	`blackstone_slab`
Polished Blackstone Slab	`polished_blackstone_double_slab`	`polished_blackstone_slab`
Polished Blackstone Brick Slab	`polished_blackstone_brick_double_slab`	`polished_blackstone_brick_slab`
Cut Copper Slab	`double_cut_copper_slab`	`cut_copper_slab`
Exposed Cut Copper Slab	`exposed_double_cut_copper_slab`	`exposed_cut_copper_slab`
Weathered Cut Copper Slab	`weathered_double_cut_copper_slab`	`weathered_cut_copper_slab`
Oxidized Cut Copper Slab	`oxidized_double_cut_copper_slab`	`oxidized_cut_copper_slab`
Waxed Cut Copper Slab	`waxed_double_cut_copper_slab`	`waxed_cut_copper_slab`
Waxed Exposed Cut Copper Slab	`waxed_exposed_double_cut_copper_slab`	`waxed_exposed_cut_copper_slab`
Waxed Weathered Cut Copper Slab	`waxed_weathered_double_cut_copper_slab`	`waxed_weathered_cut_copper_slab`
Waxed Oxidized Cut Copper Slab	`waxed_oxidized_double_cut_copper_slab`	`waxed_oxidized_cut_copper_slab`

Slabs that still need splitting too, and as such are not included in the table above:

Block	Double ID	Single ID	Java ID
Smooth Stone Slab	`double_stone_slab`	`stone_slab`	`smooth_stone_slab`
Sandstone Slab			`sandstone_slab`
Wooden Slab			`petrified_oak_slab`
Cobblestone Slab			`cobblestone_slab`
Brick Slab			`brick_slab`
Stone Brick Slab			`stone_brick_slab`
Quartz Slab			`quartz_slab`
Nether Brick Slab			`nether_brick_slab`
Red Sandstone Slab	`double_stone_slab2`	`stone_slab2`	`red_sandstone_slab`
Purpur Slab			`purpur_slab`
Prismarine Slab			`prismarine_slab`
Dark Prismarine Slab			`dark_prismarine_slab`
Prismarine Brick Slab			`prismarine_brick_slab`
Mossy Cobblestone Slab			`mossy_cobblestone_slab`
Smooth Sandstone Slab			`smooth_sandstone_slab`
Red Nether Brick Slab			`red_nether_brick_slab`
End Stone Slab	`double_stone_slab3`	`stone_slab3`	`end_stone_slab`
Smooth Red Sandstone Slab			`smooth_red_sandstone_slab`
Polished Andesite Slab			`polished_andesite_slab`
Andesite Slab			`andesite_slab`
Diorite Slab			`diorite_slab`
Polished Diorite Slab			`polished_diorite_slab`
Granite Slab			`granite_slab`
Polished Granite Slab			`polished_granite_slab`
Mossy Stone Brick Slab	`double_stone_slab4`	`stone_slab4`	`mossy_stone_brick_slab`
Smooth Quartz Slab			`smooth_quartz_slab`
Stone Slab			`stone_slab`
Cut Sandstone Slab			`cut_sandstone_slab`
Cut Red Sandstone Slab			`cut_red_sandstone_slab`