[Feature Request] Ability to disable loading partials from the filesystem

[alanyee]

Interesting point raised in https://github.com/apache/incubator-superset/pull/11617

Developers should be able to turn off potentially unsafe features — in this case, loading in partials — if they do not plan to use them.

[noahmorrison]

Does this commit close this issue for you?

[alanyee]

LGTM 👍