feat(esp-wifi): Implement serde:{Deserialize, Serialize} for wifi structs

[AnthonyGrondin]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo xtask fmt-packages command to ensure that all changed code is formatted correctly.
• My changes were added to the CHANGELOG.md in the proper section.
• I have added necessary changes to user code to the Migration Guide.
• My changes are in accordance to the esp-rs API guidelines

Extra:

• I have read the CONTRIBUTING.md guide and followed its instructions.

Pull Request Details 📖

Description

Since support for embedded-svc was dropped in fd57488, code that previously relied on those traits can migrate to the equivalent from esp-wifi. Except that traits in embedded-svc implement serde::{Serialize, Deserialize}, so it was not a drop-in equivalent. This PR adds this functionality.

• Since no-std-net is currently broken when building with serde (See: cargo check --no-default-features --features serde broken on master dunmatt/no-std-net#15), I decided to remove it and use core::net types instead.
• EapClientConfiguration uses 'static as lifetimes, so I had to use #[serde(skip)] for it. If a 'static lifetime isn't a strict requirement, it would be easier to loosen the lifetime.

Testing

I tested in a custom app I'm developing that this works as a drop-in replacement after implementing the serde traits.

[jessebraham]

LGTM, thanks!

[JurajSadel]

Thanks!