[FEATURE] Feature request - Create a slab allocator for all kernel structures

[bSchnepp]

Issue Checklist

• A related or similar issue is not already marked as open
• Another issue describing a similar feature has not already been marked as wontfix or closed
• This feature is not already present in the software

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Feature Description
A slab allocator should be used by the kernel to allocate and initialize objects very quickly, and with minimal fragmentation.
Ideally, total fragmentation should not exceed 20% of a page size (roughly 800 bytes).

Feature Benefits
List the reasons why this feature would be beneficial

• Use after free bugs are much more difficult to take advantage of
• Solaris, L4, and Linux all use this kind of allocator
• Predictable performance and avoiding mixing kernel memory with userland memory
• Cache benefits, for iterating over all processes

Use case examples
List examples where this feature could be useful for end users.

• System performance will be improved
• Security is improved for free
• Stronger guarantees about object consistency
• Can be combined with a generic buddy or simple doubly linked allocator for more fine-grained control (see Linux)

Additional information
Any additional information should be placed here.

[bSchnepp]

We should at least be good for having a single cache as of 0bd7b11