Update `embassy` to latest version

[HaoboGu]

Latest embassy has lots of new features and fixes some known issues of stm32f1 series. We should update to latest version of embassy.

There are several blockers currently:

• [x] wait for sequential-storage v2.0.0 releasing to crates.io
• [ ] wait for new version of embassy-stm32 releasing to crates.io.

Update: new versions of embassy-nrf and embassy-rp have already been released to crates.io. They're updated in a separate PR #53

• [ ] wait for esp-idf-hal releasing the compatible version to crates.io