fix: several bugs (see the PR description)

Types of changes

[ ] Chore (a non-breaking change which is related to package maintenance)
[x] Bug fix (a non-breaking change which fixes an issue)
[ ] New feature (a non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

This PR fixes several bugs introduced in the most recent release:

Moves @prismicio/client to a dev dependency, which prevents npm from altering the version number upon publishing.
Remove runtime dependence on @prismicio/client
CLI: Fixed an error in the CLI due to an underlying API change in meow (alias -> shortFlag).
CLI: Added detection support for slicemachine.config.json when initializing a configuration file.
detectTypesProvider: Correctly resolve type providers when a custom cwd is provided.
Remove duplicate @prismicio/client import when @prismicio/client is used as the types provider and includeCreateClientInterface is enabled.

[ ] My change requires an update to the official documentation.
[x] All TSDoc comments are up-to-date and new ones have been added where necessary.
[x] All new and existing tests are passing.