QL4QL: Add test for ql/inline-overlay-caller query

Author: kaspersv

ql/ql/test/queries/overlay/InlineOverlayCaller/InlineOverlayCaller.expected

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+| Test.qll:7:11:7:13 | ClasslessPredicate foo | This possibly local non-private inline predicate will not be inlined across the overlay frontier. This may negatively affect evaluation performance. Consider adding an `overlay[caller]` annotation to allow inlining across the overlay frontier. Note that adding an `overlay[caller]` annotation affects semantics under overlay evaluation. |

ql/ql/test/queries/overlay/InlineOverlayCaller/InlineOverlayCaller.qlref

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+queries/overlay/InlineOverlayCaller.ql

ql/ql/test/queries/overlay/InlineOverlayCaller/Test.qll

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+overlay[local?]
+module;
+
+import ql
+
+pragma[inline]
+predicate foo(int x) { x = 42 }
+
+overlay[caller]
+pragma[inline]
+predicate bar(int x) { x = 43 }
+
+pragma[inline]
+private predicate baz(int x) { x = 44 }