feat: kernel virtmem cont #189
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This brings back the behaviour of `BumpAllocator::lower_bound` of preventing the loader from overriding its own memory in a more scalable way
The previously used `align_down` implementation was incorrect as it would cause previously aligned addresses (where the offset was 0) to become unaligned. This patch fixes both this behaviour and makes both `align_down` and `align_up` more efficient
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This PR improves on the virtual memory management code previously introduced in #158.
AddressSpace::find_spotto correctly allocate a virtual memory region.AddressSpacetype has also received initial support for processing a page fault against the address space throughAddressSpace::page_fault.