CLI Interface for conjure_oxide

[niklasdewally]

In order to make conjure-oxide actually usable, it needs to have a CLI interface.

As a starting point, we need

• A conjure solve command that takes an Essence file and optionally a params file, produces a solution, and saves it to a file
• CLI parameters to select the solver
• CLI patrameters to select a specific frontend
• (MAYBE) flags to enable specific "unstable" features

Wishlist:

• Need to support common UNIX patterns (e.g taking input from stdin, output to stdout)
• Need to stay as close to original conjure as possible
• Need to support a variety of use cases (not just "take a file, get all solutions"

[gskorokhod]

Closing #103 as duplicate of this

[niklasdewally]

We store global settings in a global context object (https://github.com/conjure-cp/conjure-oxide/blob/main/crates/conjure_core/src/context.rs), as described in #221.

Looking at the UX of Conjure-Oxide, and writing/improving the CLI in general could be a good first issue.

[niklasdewally]

This is somewhat ill-defined, so I'll close it for now, and split UX upgrades into individual issues