Create core library using high priority operators

A smaller core library is created using a subset of the operators.
Changed the structure of filelist.json in order to include more
information about the kernels and make the selection easier.

Resolves: COMPMID-4514

Change-Id: I079ca7d8e64346174eebdd13b834e1dd4dc36ca2
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5786
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/.gitignore b/.gitignore
index e917c49..2e7f887 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@
 *.txt
 *.xml
 *.embed
+*.diff
 
 # Generated Android bp file
 Generated_Android.bp