Write Exif data block for HEIF files

Pass in Exif data block as a muxer data sample on each
image track. Add support in MPEG4Writer to write it out.

Allow grid to be used even when there is only 1 tile,
as some encoders can't encode very small images, using
grid allows them to encode in a supported size then apply
a crop to final size.

Also be more strict on esitmating the file level meta
size, since we now have to also reserve for Exif items.

bug: 79476308

Change-Id: I4b7d3af18cfb55a52f7218d9e7b6ad6f85f34343