tests: add stream_size prefilter tests

tests/streamsize-keyword-02-prefilter/README.md

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+# Description
+
+Test stream_size keyword as prefilter.

tests/streamsize-keyword-02-prefilter/test.rules

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+alert tcp any any -> any any (flow:established,to_server; stream_size:server,<,1111; prefilter; content: "EICAR"; sid:1234;)

tests/streamsize-keyword-02-prefilter/test.yaml

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+pcap: ../smb-eicar-file/input.pcap
+
+# disables checksum verification
+args:
+- -k none
+
+checks:
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 1234

tests/streamsize-keyword-03-prefilter-pseudo/README.md

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+# Description
+
+Test stream_size keyword as prefilter on timeout packet
+

tests/streamsize-keyword-03-prefilter-pseudo/test.rules

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+alert tls any any -> any any (msg:"SERVER HELLO DATA - to_client"; flow:established,to_client; tls.random; content:"|54 b8 f7 73|"; bsize:>1; stream_size:server,>,1111; prefilter; sid:1234;)
+

tests/streamsize-keyword-03-prefilter-pseudo/test.yaml

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+pcap: ../tls/tls-random-6989/input.pcap
+
+requires:
+  min-version: 8
+
+args:
+- -k none
+
+checks:
+  - filter:
+      count: 1
+      match:
+        event_type: alert
+        alert.signature_id: 1234