unified: Add standard query suites

The suites include 'Unified' in their name. It sounds a bit off but
it might cause confusion if we don't include some kind of language name
in there.

unified/ql/src/codeql-suites/unified-code-quality-extended.qls

@@ -0,0 +1,3 @@
+- queries: .
+- apply: code-quality-extended-selectors.yml
+  from: codeql/suite-helpers

unified/ql/src/codeql-suites/unified-code-quality.qls

@@ -0,0 +1,3 @@
+- queries: .
+- apply: code-quality-selectors.yml
+  from: codeql/suite-helpers

unified/ql/src/codeql-suites/unified-code-scanning.qls

@@ -0,0 +1,4 @@
+- description: Standard Code Scanning queries for Unified
+- queries: .
+- apply: code-scanning-selectors.yml
+  from: codeql/suite-helpers

unified/ql/src/codeql-suites/unified-security-and-quality.qls

@@ -0,0 +1,4 @@
+- description: Security-and-quality queries for Unified
+- queries: .
+- apply: security-and-quality-selectors.yml
+  from: codeql/suite-helpers

unified/ql/src/codeql-suites/unified-security-experimental.qls

@@ -0,0 +1,4 @@
+- description: Extended and experimental security queries for Unified
+- queries: .
+- apply: security-experimental-selectors.yml
+  from: codeql/suite-helpers

unified/ql/src/codeql-suites/unified-security-extended.qls

@@ -0,0 +1,4 @@
+- description: Security-extended queries for Unified
+- queries: .
+- apply: security-extended-selectors.yml
+  from: codeql/suite-helpers