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Add a `delayed_pure` global setting (#2178)

* Add a `delayed_pure` global setting

Adds `delayed_pure` to `set_options`, and changes the precedence of
`pure` in delayed calls to the following (in order of decreasing
precedence):

- Specified via the keyword `pure` in the call directly (e.g. `foo(1, 2,
  pure=True`))
- Specified as a property of the callable via the `pure` keyword to
  `delayed` (e.g. `delayed(foo, pure=True)(1, 2)`)
- Specified via the global `delayed_pure` setting
- Otherwise False

* Add requested tests

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