Add more code/config file extensions to CODE_EXTENSIONS

[haiphucnguyen]

Missing common ones:

• toml (Cargo.toml, pyproject.toml)
• lock (Cargo.lock, package-lock.json)
• tf, tfvars (Terraform)
• dockerfile (no extension)
• makefile (no extension)
• nix, dhall
• jsonc, json5
• graphql, gql
• proto (Protobuf)
• wasm-adjacent: wat
• zig, v (emerging languages)
• mod, sum (Go modules)

Add to FileTypeSupport.kt → update FileContentExtractor if needed → add test cases.

[miguel-baptista07]

Hello @haiphucnguyen, I would like to work on this issue.