[#1996] Implement ligodep for CameLIGO

Motivation and Context

Related Issue(s): #1996

Description

Introduces Ligo_dep_cameligo module to find references to the external modules in the Ast_core.program. Given an Ast_core.program, it folds over this tree, building the module scope. The module scope is then checked at each reference of a Module_var.t, if it is not present in the scope, then the module is added to the set of external modules.

Component

• compiler
• website
• webide
• vscode-plugin
• debugger

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Performance improvement (non-breaking change that improves performance)
• None (change with no changelog)

Changelog

Introduced module to find all references to external modules in the Ast_core.program.

Checklist:

• If a new syntax has been introduced, put a message on slack ligo-lsp
• Changes follow the existing coding style (use dune @fmt to check).
• Tests for the changes have been added (for bug fixes / feature).
• Documentation has been updated.
• Changelog description has been added (if appropriate).
• Start titles under ## Changelog section with #### (if appropriate).
• There is no image or uploaded file in changelog
• Examples in changed behaviour have been added to the changelog (for breaking change / feature).