Merge #601

601: [part 1/n] Change macrotables to build.rs codegen r=lulf a=Dirbaio

This PR replaces the "macrotables" (the macros like `stm32_data::peripherals!`) with a `const METADATA`.

Macrotables had some problems:

- Hard to debug
- Somewhat footgunny (typo the "pattern" and then nothing matches and the macro now expands to nothing, silently!)
- Limited power
  - Can't count, so we had to add a [special macrotable for that](https://github.com/embassy-rs/embassy/blob/f50f3f0a73a41275e6ea21d8661081acad381e05/embassy-stm32/src/dma/bdma.rs#L26).
  - Can't remove duplicates, so we had to fallback to [Rust code in build.rs](https://github.com/embassy-rs/embassy/blob/f50f3f0a73a41275e6ea21d8661081acad381e05/embassy-stm32/build.rs#L105-L145)
  - Can't include the results as a listto another macro, so again [build.rs](https://github.com/embassy-rs/embassy/blob/master/embassy-stm32/build.rs#L100-L101).

They work fine for the 95% of cases, but for the remaining 5% we need Rust code in build.rs. So we might as well do everything with Rust code, so everything is consistent.

The new approach generates a `const METADATA: Metadata = Metadata { ... }` with [these structs](https://github.com/embassy-rs/embassy/blob/unmacrotablize/stm32-metapac-gen/src/assets/metadata.rs) in `stm32-metapac`. `build.rs` can then read that and generate whatever code.


Co-authored-by: Dario Nieuwenhuis <[email protected]>

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