Please add a way to embed the `FyneApp.toml` metadata into the `go build`.

[mondy]

Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

Simply put, I want to disable -H=windowsgui and embed the FyneApp.toml metadata.
See #3781 and #3604.

The option to disable -H=windowsgui in fyne build was not accepted.
However, if there is a way to add metadata when go build, the problem is solved.

Is it possible to construct a solution with the existing API?

No response

Describe the solution you'd like to see.

Add a new subcommand to the fyne command to generate metadata source code.
The source code to set the metadata is generated at fyne build time.
The source code for the following section will be helpful.

https://github.com/fyne-io/fyne/blob/e332a5e47813bff1af9631cbbfe84654c0143189/cmd/fyne/internal/commands/build.go#L377C6-L377C28

Or maybe there is a better way. Is there anything?

[andydotxyz]

As you can see in the PR #4715 I realised that it should be possible to do this completely transparently so that when you run using standard Go tools we pick up metadata if present.

[andydotxyz]

From v2.5.0 this will just work by default :)