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Add DSL to Required

This commit adds DSL functionality to Required. The new DSL makes it
easier to use required as you can now write cleaner expressions, which
map directly to Required and R objects.

The DSL has the following features:

* Supports string and float/int literals
* Supports nested expressions
* Supports arithmetic on R objects
* Supports calling whitelisted functions/callables

The validate decorator has been extended to extract validation rules
from the function docstring making it easier to write rules in place.

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