We are attempting to flatten the `util` module; move the `bip152` module
to the crate root out of `util`.
Currently `src/util/` is ignored by the formatter so this move causes
the `bip152` module to be formatted.
We give one release cycle for deprecating old code so as to make the
upgrade path easier for downstream users.
Remove code deprecated during the last release (v0.29.0).
Create a directory `bitcoin` and move into it the following as is with
no code changes:
- src
- Cargo.toml
- contrib
- test_data
- examples
Then do:
- Add a workspace to the repository root directory.
- Add the newly created `bitcoin` crate to the workspace.
- Exclude `fuzz` and `embedded` crates from the workspace.
- Add a contrib/test.sh script that runs contrib/test.sh in each
sub-crate
- Fix the bitcoin/contrib/test.sh script