scanner: add a filter to escape ei protocol names

By default escape them with backticks for markdown

proto/ei-scanner

@@ -807,9 +807,19 @@ def generate_source(
     def filter_as_c_arg(name):
         return f"struct {name} *{name}"
 
+    # escape any ei[s]?_foo.bar with markdown backticks
+    def filter_ei_escape_names(str, quotes="`"):
+        if not str:
+            return str
+
+        import re
+
+        return re.sub(rf"({component}[_-]\w*)(\.\w*)?", rf"{quotes}\1\2{quotes}", str)
+
     env.filters["c_type"] = filter_c_type
     env.filters["as_c_arg"] = filter_as_c_arg
     env.filters["camel"] = snake2camel
+    env.filters["ei_escape_names"] = filter_ei_escape_names
     jtemplate = env.get_template(filename)
     return jtemplate.stream(data)