feat: implement mjfilter file for templates (#1244)

* feat: implement mjfilter file for templates

Signed-off-by: Devin Buhl <devin@buhl.casa>

* fix: use data.get in mjfilters

Signed-off-by: Devin Buhl <devin@buhl.casa>

---------

Signed-off-by: Devin Buhl <devin@buhl.casa>

makejinja.toml

@@ -1,7 +1,7 @@
 [makejinja]
 inputs = ["./bootstrap/templates"]
 output = "./"
-exclude_patterns = ["*.partial.yaml.j2"]
+exclude_patterns = [".mjfilter.py", "*.partial.yaml.j2"]
 data = ["./bootstrap/vars/addons.yaml", "./bootstrap/vars/config.yaml"]
 import_paths = ["./bootstrap/scripts"]
 loaders = ["plugin:Plugin"]