Add a verbose mode

[mara-schulke]

This merge request is introducing a verbose mode to buffrs which allows debug logs to be output with level, src file, location, and a random prefix (to distinguish multiple parallel buffrs invocations from eachother).

Example output without verbose mode (stays as is):

:: installed foo-package@0.1.0

Example output in verbose mode:

[6fed92f2] INFO  src/operations/installer.rs:310 buffrs::operations::installer: installed foo-package@0.1.0
[6fed92f2] INFO  src/operations/installer.rs:155 buffrs::operations::installer: running install for package: bar-package
[6fed92f2] INFO  src/operations/installer.rs:250 buffrs::operations::installer: bar-package@0.1.0
[6fed92f2] DEBUG src/resolver.rs:374 buffrs::resolver: resolved bar-package@0.1.0 from local cache
[6fed92f2] DEBUG src/operations/installer.rs:399 buffrs::operations::installer: using workspace lockfile version for bar-package@0.1.0
[6fed92f2] DEBUG src/package/store.rs:145 buffrs::package::store: unpacked bar-package@0.1.0 into foo-package/proto/vendor/bar-package

This allows to debug and fix issues in production builds. Verbose output can also be toggled via BUFFRS_VERBOSE=true so that all subsequent buffrs commands output debug info (useful in CI).