tests/http2: add test for content-encoding case insensitivity

Ticket: 8760

diff --git a/tests/http2-deflate-case/README.md b/tests/http2-deflate-case/README.md
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+++ b/tests/http2-deflate-case/README.md
@@ -0,0 +1,10 @@
+# Description
+
+Test http2 content-encoding case insensitivity
+
+https://redmine.openinfosecfoundation.org/issues/8760
+
+# PCAP
+
+The pcap comes from running dummy HTTP2 server with `go run server.go`
+and client `curl --compressed -H 'Accept-Encoding: deflate' --http2 127.0.0.1:8080/` and seeing the decompressed output

diff --git a/tests/http2-deflate-case/input.pcap b/tests/http2-deflate-case/input.pcap
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index 0000000..42560ff
Binary files /dev/null and b/tests/http2-deflate-case/input.pcap differ

diff --git a/tests/http2-deflate-case/server.go b/tests/http2-deflate-case/server.go
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+++ b/tests/http2-deflate-case/server.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+       "compress/flate"
+       "fmt"
+       "golang.org/x/net/http2"
+       "golang.org/x/net/http2/h2c"
+       "net/http"
+)
+
+func main() {
+       h2s := &http2.Server{}
+
+       handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+               h := w.Header()
+               h["content-encoding"] = []string{"DeFlate"}
+               fw, err := flate.NewWriter(w, 1)
+               if err != nil {
+                       fmt.Fprintf(w, "FAIL %s, %v, http: %v", err, r.URL.Path, r.TLS == nil)
+               }
+               fmt.Fprintf(fw, "Hello, %v, http: %v", r.URL.Path, r.TLS == nil)
+               fw.Flush()
+       })
+
+       server := &http.Server{
+               Addr:    "0.0.0.0:8080",
+               Handler: h2c.NewHandler(handler, h2s),
+       }
+
+       fmt.Printf("Listening [0.0.0.0:8080]...\n")
+       err := server.ListenAndServe()
+       fmt.Printf("lol %s", err)
+}

diff --git a/tests/http2-deflate-case/test.yaml b/tests/http2-deflate-case/test.yaml
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+++ b/tests/http2-deflate-case/test.yaml
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+requires:
+  min-version: 9
+
+args:
+  - -k none
+
+checks:
+
+  # Check that there is one file event with decompressed length.
+  - filter:
+      count: 1
+      match:
+        event_type: fileinfo
+        http.length: 30
+        http.version: "2"
+        fileinfo.size: 20
+  - filter:
+      count: 0
+      match:
+        event_type: anomaly