Feature request: Grab strategy

[Vincent-Beltman-Inspiro]

The C++ SDK offers the option to choose between various grab strategies. Which uses this enum.
Could you add this option or instruct me how this should be added?

[astraw]

My suggestion is to use TimeoutHandling, from the C++ and Rust sides, as an example of how to wrap a C++ enum in Rust. Then expand the Rust GrabOptions struct to have a grab_strategy: Option<GrabStrategy> field where this defaults to None. Hopefully we can add a way to build a rust GrabStrategy struct without requiring a semver bump.

[Vincent-Beltman-Inspiro]

@astraw Created a PR: #18