ext4: add tracepoints for EOF block zeroing and disksize-grow I/O

Add tracepoints to track the disksize-grow-pending lifecycle in the
writeback path and the block-zero-EOF entry point:

- ext4_iomap_wb_disksize_pending_submit: ioend is marked as
  DISKSIZE_GROW_IO in ext4_iomap_writeback_submit().
- ext4_iomap_wb_disksize_pending_complete: ioend of type
  DISKSIZE_GROW_IO completes in ext4_iomap_finish_ioend().
- ext4_iomap_wb_disksize_pending_wait: ioend worker waits for the
  pending zeroed EOF block to complete.
- ext4_iomap_wb_update_disksize: i_disksize is advanced in
  ext4_iomap_wb_update_disksize, including the new value and
  whether the update is a disksize-grow completion.
- ext4_block_zero_eof: ext4_block_zero_eof is called with the range
  and zeroing outcome, capturing the producer-side entry point.

Together with the previous mark/clear/wait tracepoints, these cover the
full lifetime of the disksize-grow-pending state.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://patch.msgid.link/20260903124017.2325538-1-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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