Kernel: Changed stat values from func to be field

- Removed virtual functions for all of the stat stuff.
This did however introduce some issues, mainly with /proc
becoming out of sync if you changed your ID. I propose we
do the linux thing and just have a stat update function
which is optional, but allows dynamic updates of stat fields
for cases such as those in uid/gid in /proc.
- Simplified the API, although still kind of annoying
it is a bit simpler.
- Moved some of the FS structure from having the FS inode inside
the in memory inode to a Serialise <-> Deserialise model where
Inodes are deserialised from disk into in memory ones and then
back into on disk ones when it comes time for syncing.
This makes it semantically better in my opinion, as it explicitly
separates disk and non-disk functionality.

kernel/include/kernel/Storage/ATA/ATADevice.h

@@ -31,8 +31,6 @@ namespace Kernel
 			BAN::StringView model() const { return m_model; }
 			BAN::StringView name() const override { return m_name; }
 
-			dev_t rdev() const override { return m_rdev; }
-
 		protected:
 			ATABaseDevice();
 			BAN::ErrorOr<void> initialize(BAN::Span<const uint16_t> identify_data);
@@ -46,8 +44,6 @@ namespace Kernel
 			bool m_has_lba;
 			char m_model[41];
 			char m_name[4] {};
-
-			const dev_t m_rdev;
 		};
 
 	}