Adventure 5.0

[kezz]

To-do list

• Add a note about abstract component renderer changes
• Add a note about text format being sealed
• Add a change entry about the GSON library version bump (we will try not to use new features, also the quirk about null now returning null and not throwing an exception)
• Document the removal of deprecated JSON serializer methods that are now done via options instead
• Add a note about the switch to JSpecify annotations
• Add a note about custom click payload nbt field becoming nullable
• Add a note about the new-nullability of ChatType#key and the fact it doesn't implement Keyed anymore
• Document the removal of UTF8ResourceBundleControl
• Nullability isn't at module level, it's class/package level
• Remove the SBA synthetic stuff
• Give the rest of the docs a quick look over to ensure we're not yapping/exampling anything that's now removed

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[Privatech38]

This PR should also adress #749 since v5 throws an error if SNBT is used instead of a list of data components

[kezz]

This PR should also adress #749 since v5 throws an error if SNBT is used instead of a list of data components

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