Implement bucket bind CRUD operations and config loading, along with
CLI integration for listing, setting, and removing bucket bindings.

Add bucket init logic with directory structure creation and log macros
for tracing

Introduce a build.rs that generates a version.txt file with the
package version, git commit hash, and date. Also generate shell
completion scripts using mingling's build utilities.

Migrate the `-v/--version` flag to read from the generated
version.txt and replace BasicProgramSetup with HelpFlagSetup.

Add bucket creation logic with pre-checks, localized error handling, and
a basic CLI entry point using the mingling framework. Introduce a
placeholder protocol for bucket transfer testing.