Introduce the `javy-config` crate

[saulecabrera]

This commit prepares the terrain to bridge the gap in configurability between the CLI and Javy, the crate. The intention behind introducing a new crate is to:

• Reduce code duplication and sync the options between the CLI and the core crate.
• Make it easy to pass the options into WebAssemlby by using bitflags.

This PR doesn't introduce any new functionality. A follow up PR will include new commands in the CLI which will make use of the share configuration.

Checklist

• [x] I've updated the relevant CHANGELOG files if necessary. Changes to javy-cli and javy-core do not require updating CHANGELOG files.
• [x] I've updated the relevant crate versions if necessary. Versioning policy for library crates
• [x] I've updated documentation including crate documentation if necessary.

[saulecabrera]

In case the intention is not clear from the commit message/PR, the intention is to pass the config as a single u32 into WebAssembly, hence the usage of bitflags.