Add a NewBasicEngine function

[jam3sn]

Checklist

• I have read the contribution guidelines.
• make test passes.
• make lint passes.
• New and changed code is covered by tests.
• Performance improvements include benchmarks.
• Changes match the documented (not just the implemented) behavior of Shopify.

This PR follows up this issue I raised recently.

I'd like to add new function to create a "basic" liquid engine which provides an instance of the liquid engine without the standard filters or tags registered. This would allow the developer to still render variables in a liquid template, but only use tags and filter they wish to register.