Kernel: Implement madvise/posix_fadvise
madvise allows a userspace programm to tell the kernel, how it intends to access mapped memory.
Currently we only load mapped files lazily one page at a time, when said page is accessed, which slows down serial IO intensive workloads like multimedia decoders.
For such applications it might be useful to support MADV_SEQUENTIAL to increase the loaded pages at a time, or even MADV_WILLNEED to start an early (asynchronous) load of the mapped data
Also linux' MADV_FREE might be helpful to allow the kernel to for example reclaim parts of the heap that are no longer needed
Additionally MADV_SEQUENTIAL can be used as a hint to the kernel during memory pressure to prefer early pages of mapped files during eviction
Similar goes for the more posixy posix_fadvise
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