Add support for custom configuration

[AlixANNERAUD]

WAMR offers a wide variety of configurations. However, currently, the wamr_rust_sdk does not provide a way to define these settings, which is unfortunate. To address this issue, I have thought of two solutions: either using Rust's feature system for binary settings and/or using environment variables (for text / number settings and/or binary settings). If this approach is acceptable to you, I can create a PR.

[lum1n0us]

Sounds good for me. Please go ahead.

[lum1n0us]

#65

[lum1n0us]

Fixed by #65