Rust: Add diagnostic query for AST inconsistency counts.

Author: geoffw0

rust/ql/src/queries/diagnostics/AstConsistencyCounts.ql

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+/**
+ * @name Abstract syntax tree inconsistency counts
+ * @description Counts the number of abstract syntax tree inconsistencies of each type.  This query is intended for internal use.
+ * @kind diagnostic
+ * @id rust/diagnostics/ast-consistency-counts
+ */
+
+import rust
+import codeql.rust.AstConsistency as Consistency
+
+// see also `rust/diagnostics/ast-consistency`, which lists the
+// individual inconsistency results.
+from string type, int num
+where num = Consistency::getAstInconsistencyCounts(type)
+select type, num

rust/ql/test/query-tests/diagnostics/AstConsistencyCounts.expected

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+| Multiple locations | 0 |
+| Multiple parents | 0 |
+| Multiple primary QL classes | 0 |
+| Multiple toStrings | 0 |

rust/ql/test/query-tests/diagnostics/AstConsistencyCounts.qlref

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+queries/diagnostics/AstConsistencyCounts.ql