Extra-lazy parsing for custom book items

[TheRealWormbo]

Since parsing uses registry-based vanilla logic now, it will not work before the book's mod has finished loading.

Fixes #790 at the expense of potentially delayed error reporting.

[TheRealWormbo]

Tested against https://github.com/TheRealWormbo/Botania/tree/1.21.1-patchouli-snapshot – Botania's boot item still works and opens the book, even though Patchouli fails to parse the item string.

Example exception:

[07:47:58] [Render thread/ERROR] (patchouli) Failed to parse item "botania:lexicon[foo]" for book botania:lexicon defined by mod botania, skipping
 java.lang.RuntimeException: com.mojang.brigadier.exceptions.CommandSyntaxException: Unknown item component 'minecraft:foo' at position 16: ...a:lexicon[<--[HERE]
	at knot/vazkii.patchouli.common.util.ItemStackUtil.deserializeStack(ItemStackUtil.java:50) ~[Patchouli-1.21-89-FABRIC-SNAPSHOT.jar:?]
	at knot/vazkii.patchouli.common.book.Book.lambda$new$1(Book.java:165) ~[Patchouli-1.21-89-FABRIC-SNAPSHOT.jar:?]
	at knot/com.google.common.base.Suppliers$NonSerializableMemoizingSupplier.get(Suppliers.java:181) ~[guava-32.1.2-jre.jar:?]
	at knot/vazkii.patchouli.common.book.Book.getBookItem(Book.java:183) ~[Patchouli-1.21-89-FABRIC-SNAPSHOT.jar:?]
	at knot/vazkii.patchouli.common.util.ItemStackUtil.getBookFromStack(ItemStackUtil.java:106) ~[Patchouli-1.21-89-FABRIC-SNAPSHOT.jar:?]
	at knot/vazkii.patchouli.client.handler.BookRightClickHandler.onRenderHUD(BookRightClickHandler.java:35) ~[Patchouli-1.21-89-FABRIC-SNAPSHOT.jar:?]
	at knot/net.fabricmc.fabric.api.client.rendering.v1.HudRenderCallback.lambda$static$0(HudRenderCallback.java:28) ~[fabric-rendering-v1-5.0.5+df16efd019.jar:?]
	at knot/net.minecraft.client.gui.Gui.handler$zpf000$fabric-rendering-v1$render(Gui.java:1538) [minecraft-merged-14fb05758b-1.21.1-loom.mappings.1_21_1.layered+hash.730628366-v2.jar:?]
	at knot/net.minecraft.client.gui.Gui.render(Gui.java:220) [minecraft-merged-14fb05758b-1.21.1-loom.mappings.1_21_1.layered+hash.730628366-v2.jar:?]
	at knot/net.minecraft.client.renderer.GameRenderer.render(GameRenderer.java:896) [minecraft-merged-14fb05758b-1.21.1-loom.mappings.1_21_1.layered+hash.730628366-v2.jar:?]
	at knot/net.minecraft.client.Minecraft.runTick(Minecraft.java:1285) [minecraft-merged-14fb05758b-1.21.1-loom.mappings.1_21_1.layered+hash.730628366-v2.jar:?]
	at knot/net.minecraft.client.Minecraft.run(Minecraft.java:882) [minecraft-merged-14fb05758b-1.21.1-loom.mappings.1_21_1.layered+hash.730628366-v2.jar:?]
	at knot/net.minecraft.client.main.Main.main(Main.java:256) [minecraft-merged-14fb05758b-1.21.1-loom.mappings.1_21_1.layered+hash.730628366-v2.jar:?]
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:480) [fabric-loader-0.16.10.jar:?]
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) [fabric-loader-0.16.10.jar:?]
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) [fabric-loader-0.16.10.jar:?]
	at net.fabricmc.devlaunchinjector.Main.main(Main.java:86) [dev-launch-injector-0.2.1+build.8.jar:?]
Caused by: com.mojang.brigadier.exceptions.CommandSyntaxException: Unknown item component 'minecraft:foo' at position 16: ...a:lexicon[<--[HERE]

[williewillus]

The comment above parsed probably doesn't apply anymore