embassy-time-driver V0.2 impl

[ivmarkov]

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Submission Checklist 📝

• [v] I have updated existing examples or added new ones (if applicable).
• [v] I have used cargo fmt command to ensure that all changed code is formatted correctly.
• [v] I have used cargo clippy command to ensure that all changed code passes latest Clippy nightly lints.
• [v] My changes were added to the CHANGELOG.md in the proper section.

Pull Request Details 📖

Description

An embassy-time-driver implementation compatible with the just-released backwards-incompatible embassy-time-driver V0.2.

Testing

With a custom example that unfortunately cannot be pushed, or else esp-idf-svc would non-optionally depend on embassy-time, which is not ideal.