Have better support for modular models in .fga files

[holgerstolzenberg]

Situation

A modular OpenFGA model created via OpenFGA CLI will contain some hinting comments that show from what locations the model parts have been included.

These comments are placed inline with the type: whatever declarations.

These comments do not render properly in OpenFGA IntelliJ plugin breaking the color formatting and also creating an validation error.
If manually placed into a distinct comment line, it works, but this should not be necessary.

Also, a model file starting with module ... causes a validation error.

Please see attached screenshots:

Expectation

• the editor pane does not show a validation error if the .fga file is part of a modular module
• the editor pane should render the comments nicely and does not produce validation error(s)

How to reproduce

Just load a fully merged model file from a modular model into the OpenFGA editor in IntelliJ.
We have created our full model by using OpenFGA CLI via docker image:

docker run \
    --rm \
    -v "$(pwd):/data" openfga/cli:v0.6.2 model transform \
      --input-format modular \
      --output-format fga \
      --file /data/mccs.mod > "${target_path}/${target_file}"

✌️

[rhamzeh]

Thanks for raising this @holgerstolzenberg

Marking it as part of #33

Just a head's up: It's unlikely we'll get to this soon, as it will need some work (see related VS Code PR that added support).

We'll gladly review any incoming community contribution - however the core OpenFGA team is currently busy with other work.