Fix GH-10834: exif_read_data() cannot read smaller stream wrapper chunk sizes

php_stream_read() may return less than the requested amount of bytes by
design. This patch introduces a stat

Fix GH-10834: exif_read_data() cannot read smaller stream wrapper chunk sizes

php_stream_read() may return less than the requested amount of bytes by
design. This patch introduces a static function for exif which reads
from the stream in a loop until all the requested bytes are read.

For the test: Co-authored-by: dotpointer

Closes GH-10924.

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