Update SLURM loading logic (use a cache to load new data).

Update SLURM loading logic (use a cache to load new data).

+Stop searching for duplicate elements in the same file or in distinct files, also stop searching for covered prefixes at the same file; those checks don't exist at the RFC and they had a huge processing cost.
+Implement a SLURM cache when a new file is loaded, this way is easier to check RFC 8416 section 4.2 rule.
+Remove the whole context properties that were utilized to know on which file the loader was working.