MM-22782: Write fuzz testing for websockets (#14203)

* MM-22782: Write fuzz testing for websockets

* Moved to fuzz function

* incorporate review comments

* Remove some more comments

.gitignore

@@ -57,6 +57,10 @@ _testmain.go
 *.log
 *.log.jsonl
 
+# Fuzz binaries and working dir
+*fuzz.zip
+app/workdir
+
 .tmp
 
 # Vim temporary files