btrfs: refactor extent buffer bitmaps operations

[BACKGROUND]
Currently we handle extent bitmaps manually in
extent_buffer_bitmap_set() and extent_buffer_bitmap_clear().

Although with various helpers like eb_bitmap_offset() it's still a little
messy to read.  The code seems to be a copy of bitmap_set(), but with
all the cross-page handling embedded into the code.

[ENHANCEMENT]
This patch would enhance the readability by introducing two helpers:

- memset_extent_buffer()
  To handle the byte aligned range, thus all the cross-page handling is
  done there.

- extent_buffer_get_byte()
  This for the first and the last byte operations, which only need to
  grab one byte, thus no need for any cross-page handling.

So we can split both extent_buffer_bitmap_set() and
extent_buffer_bitmap_clear() into 3 parts:

- Handle the first byte
  If the range fits inside the first byte, we can exit early.

- Handle the byte aligned part
  This is the part which can have cross-page operations, and it would
  be handled by memset_extent_buffer().

- Handle the last byte

This refactoring does not only make the code a little easier to read,
but also makes later folio/page switch much easier, as the switch only
needs to be done inside memset_extent_buffer() and extent_buffer_get_byte().

Reviewed-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>