Query block size from disk.

[todo]

We shouldn't be hardcoding block sizes here. We should be querying them from the disk.

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SunriseOS/fs/src/detail/mod.rs

Lines 40 to 50 in a2961e8

	// TODO: Query block size from disk.
	// BODY: We shouldn't be hardcoding block sizes here. We should be querying them
	// BODY: from the disk.
	/// Size of a block.
	const BLOCK_SIZE: usize = 512;
	/// Size of a block in u64.
	const BLOCK_SIZE_U64: u64 = BLOCK_SIZE as u64;
	impl<'a> PartitionManager<'a> {
	/// Create a new partition manager.
	pub fn new(inner: &'a mut dyn IStorage<Error = Error>) -> Self {

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This issue was generated by todo based on a TODO comment in a2961e8 when #501 was merged. cc @roblabla.