flow/pkt: add test for either dir

tests/detect-flow-pkts-either/README.md

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+Test
+====
+
+Test `flow.pkts:either`.. and `flow.bytes:either`.. keywords
+
+PCAP
+====
+
+From existing s-v test.
+
+Related tickets
+==============
+https://redmine.openinfosecfoundation.org/issues/5646

tests/detect-flow-pkts-either/test.rules

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+alert ip any any -> any any (msg:"Flow has more than 3000 bytes and 10 pkts in either direction";flow.pkts:either,=10;flow.bytes:either,>3000; sid:1;)
+alert ip any any -> any any (msg:"Flow has 10 pkts in toserver direction";flow.pkts:toserver,=10;sid:2;)
+alert ip any any -> any any (msg:"Flow has 10 pkts in toclient direction";flow.pkts:toclient,=10;sid:3;)
+alert ip any any -> any any (msg:"Flow has more than 3000 bytes in toserver direction";flow.bytes:toserver,>3000; sid:4;)
+alert ip any any -> any any (msg:"Flow has more than 3000 bytes in toclient direction";flow.bytes:toclient,>3000; threshold: type backoff, track by_flow, count 2, multiplier 10; sid:5;)

tests/detect-flow-pkts-either/test.yaml

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+requires:
+  min-version: 8
+
+pcap: ../decode-teredo-01/input.pcap
+
+args:
+- -k none
+
+checks:
+- filter:
+    count: 3
+    match:
+      event_type: alert
+      alert.signature_id: 1
+
+- filter:
+    count: 3
+    match:
+      event_type: alert
+      alert.signature_id: 2
+
+- filter:
+    count: 1
+    match:
+      event_type: alert
+      alert.signature_id: 3
+
+- filter:
+    count: 0
+    match:
+      event_type: alert
+      alert.signature_id: 4
+
+- filter:
+    count: 2
+    match:
+      event_type: alert
+      alert.signature_id: 5