Expose bindings

[indexds]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
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Pull Request Details 📖

Description

See esp-rs/esp-idf-svc#537 for more details. The goal is to be able to access the underlying netif struct from an esp_netif_t.

Testing

Works. The necessary function is exposed properly:

use esp_idf_svc::sys::esp_netif_get_netif_impl