Scopes + memory groundwork

[dphfox]

Partially implements #269. This PR introduces some groundwork for future memory management changes, and introduces basic support for the 'scoped' memory management pattern (https://fluff.blog/2023/08/30/the-next-ten-years-beyond-maids.html, https://github.com/dphfox/scoped).

• [x] Move all memory management utilities into a dedicated Memory folder
• [x] Rename cleanup to doCleanup for consistency (#237)
• [x] Add destroy methods to all objects
• [x] Add type information for destroy methods on objects
• [x] Add cleanup tables as first parameters to all constructors
• [x] Warn when scopes mismatch for things expected to have the same lifetime
• [x] Implement scoped() syntax sugar for cleanup tables w/ constructor methods
• [x] Generate inner scopes for state objects
• [x] Ensure type checking mostly passes for additions, and note where it does not currently work so it can be targeted for future PRs
• [x] Update unit tests
• [ ] Update API reference
  • [x] Restructure API reference to separate types from members
  • [x] Fix Errors page not rendering
  • [x] Remove old errors from Errors page
  • [x] Update formatting of API pages
  • [ ] Create or update documentation pages
    • [ ] Commonly Used
    • [ ] General
      • [ ] Errors
        • [x] cannotAssignProperty
        • [x] cannotConnectChange
        • [x] cannotConnectEvent
        • [x] cannotCreateClass
        • [ ] callbackError
        • [ ] forKeyCollision
        • [ ] forProcessorError
        • [ ] invalidChangeHandler
        • [ ] invalidAttributeChangeHandler
        • [ ] invalidEventHandler
        • [ ] invalidPropertyType
        • [ ] invalidRefType
        • [ ] invalidOutType
        • [ ] invalidAttributeOutType
        • [ ] invalidOutProperty
        • [ ] invalidSpringDamping
        • [ ] invalidSpringSpeed
        • [ ] mistypedSpringDamping
        • [ ] mistypedSpringSpeed
        • [ ] mistypedTweenInfo
        • [ ] noTaskScheduler
        • [ ] springTypeMismatch
        • [ ] stateGetWasRemoved
        • [ ] unknownMessage
        • [ ] unrecognisedChildType
        • [ ] unrecognisedPropertyKey
        • [ ] unrecognisedPropertyStage
      • [x] Types
        • [x] Version
        • [x] Contextual
      • [x] Members
        • [x] version
        • [x] Contextual
    • [x] Memory
      • [x] Types
        • [x] Scope
        • [x] ScopedObject
        • [x] Task
      • [x] Members
        • [x] deriveScope
        • [x] doCleanup
        • [x] scoped
    • [x] State
      • [x] Types
        • [x] CanBeState
        • [x] Computed
        • [x] Dependency
        • [x] Dependent
        • [x] For
        • [x] Observer
        • [x] StateObject
        • [x] Use
        • [x] Value
      • [x] Members
        • [x] Computed
        • [x] ForKeys
        • [x] ForPairs
        • [x] ForValues
        • [x] Observer
        • [x] peek
        • [x] Value
    • [x] Roblox
      • [x] Types
        • [x] Child
        • [x] PropertyTable
        • [x] SpecialKey
      • [x] Members
        • [x] Attribute
        • [x] AttributeChange
        • [x] AttributeOut
        • [x] Children
        • [x] Hydrate
        • [x] New
        • [x] OnChange
        • [x] OnEvent
        • [x] Out
        • [x] Ref
    • [ ] Animation
      • [ ] Types
        • [ ] Animatable
        • [ ] Spring
        • [ ] Tween
      • [ ] Members
        • [ ] Spring
        • [ ] Tween
• [x] Update examples
• [x] Update tutorials
  • [x] Write dedicated scopes section before introducing objects
  • [x] Update all code examples to use scopes

[dphfox]

I think it'd be useful to pull in concepts from #220 for the backend implementation of the For objects. This won't be exposed to users yet - and it probably wouldn't be the final implementation because of #205 - but it'll be useful for tidying up those rat's nests and ensuring they have consistent destruction and memory management.

[dphfox]

Working on debugging the unified internal For implementation now.

[dphfox]

Now disposing of unused processors at the right time :)

[dphfox]

New For object implementations are now passing unit tests.

[dphfox]

I'm running into issues with typechecking that seem hard to surmount. They might actually be bugs in Luau or the luau-lsp plugin.

I'm going to simply try and fix a decent amount of them that seem possible, and leave the rest in so that this can get out the door. I'll redistribute the type checking fixes to another issue/PR somewhere else.

[dphfox]

Examples have now all been updated to use scope syntax, and also have more fully fleshed-out explanations to go along with it. Pleasantly, a lot of the code snippets are simpler now! That's partly thanks to scopes, but also a little bit thanks to improved coding conventions generally.

[dphfox]

Since we're no longer pursuing additional API surface for the time being, this now fully closes #269.