i18n CLI tool in workspace environments

[jannistpl]

Hi everyone,

to organize my project, I split my project into several different crates, many of which require the labels provided by rust-i18n. Using the share-in-workspace example, I was able to get the functionality of the rust-i18n crate working quite easily.

I'm also using the very helpful i18n cli tool provided by this library. However, my main Cargo.toml file, configuring the workspace, does not define a package. The binary of the software lies in a separate crate. Because of that, I'm currently not able to configure the i18n cli tool, as this seems to be only configurable via a package:

[package.metadata.i18n]
# CLI tool config

This currently forces me to reorganize my project, move the binary file out of the subfolder, and additionally configure it in the main "Cargo.toml" file.

Instead, I would find it helpful to be able to also configure the tool via a workspace, for example:

[workspace.metadata.i18n]
# CLI tool config

Alternatively, the tool could also be configured using a configuration file.

Does something like this make sense, or is there another way to configure the tool?

[jannistpl]

Just noticed that there is already a PR for this use case: #93