[Feature Request] Add support for F# language parsing and indexing

[Aa728848]

Feature Description

I would like to request language support for F# (.fs, .fsi, .fsx) in CodeGraph.

F# is a powerful functional-first programming language on the .NET platform, widely used in domain-driven design, financial modeling, web services, and cloud applications. Adding F# support would significantly expand CodeGraph's capabilities within the .NET ecosystem alongside C#.

Suggested Scope & Details

• File Extensions: .fs, .fsi, .fsx
• Parser Integration: Integration of F# AST parser (e.g., utilizing tree-sitter-fsharp or FSharp.Compiler.Service).
• Symbol & Graph Extraction:
  • Modules and Namespaces (module, namespace, open)
  • Functions and Bindings (let, let rec, use, val)
  • F# Types (Discriminated Unions, Records, Type Abbreviations, Classes, Interfaces)
  • Active Patterns & Computation Expressions
• Call & Dependency Graph: Cross-module symbol navigation and reference tracking, supporting F# pipelining (|>, <|) and composition patterns.

Additional Context

• Tree-sitter reference implementation: https://github.com/ionide/tree-sitter-fsharp
• Official F# Language Docs: https://learn.microsoft.com/en-us/dotnet/fsharp/

Thank you for building CodeGraph! Looking forward to F# language support.