Sort rules directories and files

By using the natural order of their type, so that we can benefit from
a determisnic order when processing the rules.

Author: thvnx

lkql_jit/language/src/main/java/com/adacore/lkql_jit/LKQLContext.java

@@ -366,6 +366,7 @@ public String[] getRuleDirectories() {
             if (additionalRulesDirs != null) {
                 rulesDirsList.addAll(Arrays.asList(StringUtils.splitPaths(additionalRulesDirs)));
             }
+            rulesDirsList.sort(null);
             this.ruleDirectories = rulesDirsList.toArray(new String[0]);
         }
         return this.ruleDirectories;

lkql_jit/language/src/main/java/com/adacore/lkql_jit/nodes/TopLevelList.java

@@ -141,6 +141,7 @@ public void addRuleImports() {
                 if (ruleDirectoryFiles != null) {
                     ruleImports.addAll(
                         Arrays.stream(ruleDirectoryFiles)
+                            .sorted()
                             .filter(File::canRead)
                             .map(f ->
                                 new Import(