time: split driver into a separate embassy-time-driver crate.

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diff --git a/embassy-time-driver/CHANGELOG.md b/embassy-time-driver/CHANGELOG.md
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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 0.2.0 - 2023-12-04
+
+- Added tick rates in multiples of 10 kHz
+- Remove nightly and unstable-traits features in preparation for 1.75.
+- Update heapless to 0.8.
+
+## 0.1.5 - 2023-10-16
+
+- Added `links` key to Cargo.toml, to prevent multiple copies of this crate in the same binary.
+  Needed because different copies might get different tick rates, causing
+  wrong delays if the time driver is using one copy and user code is using another.
+  This is especially common when mixing crates from crates.io and git.
+
+## 0.1.4 - 2023-10-12
+
+- Added more tick rates
+
+## 0.1.3 - 2023-08-28
+
+- Update `embedded-hal-async` to `1.0.0-rc.2`
+- Update `embedded-hal v1` to `1.0.0-rc.2`
+
+## 0.1.2 - 2023-07-05
+
+- Update `embedded-hal-async` to `0.2.0-alpha.2`.
+- Update `embedded-hal v1` to `1.0.0-alpha.11`. (Note: v0.2 support is kept unchanged).
+
+## 0.1.1 - 2023-04-13
+
+- Update `embedded-hal-async` to `0.2.0-alpha.1` (uses `async fn` in traits).
+- Update `embedded-hal v1` to `1.0.0-alpha.10`. (Note: v0.2 support is kept unchanged).
+- Remove dep on `embassy-sync`.
+- Fix reentrancy issues in the `std` time driver (#1177)
+- Add `Duration::from_hz()`.
+- impl `From` conversions to/from `core::time::Duration`.
+- Add `#[must_use]` to all futures.
+- Add inherent `async fn tick()` to `Ticker`, so you can use it directly without the `Stream` trait.
+- Add more tick rates.
+- impl `Default` for `Signal`
+- Remove unnecessary uses of `atomic-polyfill`
+
+## 0.1.0 - 2022-08-26
+
+- First release