test: tests for requires keyword

Feature: #5972

tests/requires/README.md

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+Test for the "requires" keyword.

tests/requires/test.rules

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+# Rule for Suricata >= 7 and < 8.
+alert http any any -> any any (msg:"TEST Suricata >= 7 and < 8"; content:"uid=0"; requires: version >= 7, version < 8; sid:7; rev:1;)
+
+# Rule for Suricata >= 8.
+alert http any any -> any any (msg:"TEST Suricata >= 8"; content:"uid=0"; requires: version >= 8.0.0; sid:8; rev:1;)
+
+# These rules have something invalid about them, but do follow the general rule
+# structure, so should be eliminated by the requires statement.
+alert vxlan any any -> any any (requires: version >= 10; sid:1;)
+alert udp any any -> any any (vxlan_vni:10; requires: version >= 10; sid:2;)
+alert http any any => any any (requires: version >= 10; sid:3;)
+alert tcp any any -> any any (frame:smtp.not_supported; requires: version >= 10; sid:4;)

tests/requires/test.yaml

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+requires:
+  files:
+    - rust/src/detect/requires.rs
+
+pcap: ../eve-metadata/testmyids.pcap
+
+checks:
+
+  # Check that for Suricata >= 8.0.0 we have one alert and that alert is sid 8.
+  - filter:
+      requires:
+        min-version: 8
+      count: 1
+      match:
+        event_type: alert
+  - filter:
+      requires:
+        min-version: 8
+      count: 1
+      match:
+        alert.signature_id: 8
+
+  # Check that for Suricata >= 8.0.0 we have one alert and that alert is sid 8.
+  - filter:
+      requires:
+        min-version: 7
+        lt-version: 8
+      count: 1
+      match:
+        event_type: alert
+  - filter:
+      requires:
+        min-version: 7
+        lt-version: 8
+      count: 1
+      match:
+        alert.signature_id: 7
+
+
+