ext4: add EXT4_STATE_DISKSIZE_GROW_PENDING state bit and helpers

Inodes using the iomap buffered I/O path do not use data=ordered
mode, so the zeroed EOF block that straddles i_disksize needs explicit
tracking to ensure it is written back before i_disksize is advanced.

Add the EXT4_STATE_DISKSIZE_GROW_PENDING inode state bit and three
helpers: ext4_iomap_clear_disksize_pending() to atomically clear the
bit and wake waiters, ext4_iomap_wait_disksize_pending() to block until
the bit is cleared, and ext4_iomap_get_disksize_pending_range() to
compute the pending range from i_disksize.

These will be used by subsequent patches to serialize i_disksize
updates with the writeback of the zeroed EOF block.

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Tested-by: syzbot@syzkaller.appspotmail.com
Link: https://patch.msgid.link/20261009103033.2920530-22-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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