Introduce the `build` command in the CLI

[saulecabrera]

This commit introduces a build command in the CLI, which behaves exactly as the compile command and introduces a deprecation warning to the existing compile command.

Additionally, as a preparation for the CLI redesign discussed in https://github.com/bytecodealliance/javy/issues/702, this commit introduces a small refactoring of the code generation process, by:

• Introducing a code generator builder, to abstract and validate all the code generation option combinations.
• Introducing proper static and dynamic code generator modules, making it easier to divide the responsibilities of each.

The main motivation for the refactoring is to:

• Make it easier to finalize the CLI redesign.
• Share code between the compile and build command while they must be equivalent.
• Make it easier to keep the compile command frozen while it becomes deprecated and at the same time evolve the build command independently.

NB: Given that the compile and build command are exactly the same, and that this change is purely mechanical; this change doesn't introduce integration tests for the build command. The plan is to introduce tests once other options are added to the build command as part of the CLI redesign. Alternatively, tests can be added, however, it would require either duplicating the entire test suite or adding testing infrastructure to minimize duplication, which will increase the size of the change.

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.