Add code generator for assets like tarmac

[jcphlux]

What type of feature request is this?

• Mantle doesn't support a Roblox feature I would like to use
• Mantle CLI improvement
• Other

Describe your problem
While migrating from using Tarmac to Mantle the feature I miss is the code generator that would create an assets.lua file for simple referencing my assets in code.

Another reason this would be useful is when using remote state is can be difficult to get the asset ids.

Describe the solution you'd like
Might be as easy as reusing Tarmac code to generate the file.
The source on how Tormac did this is here.
codegen.rs

Add 2 setting to configure this option.

codegen = true
codegen-path = "src/ReplicatedStorage/Modules/assets.lua"

The output could look like this. Mimicking the path structure.

return {
	Image= {
		<asset_name>= "rbxassetid://<asset__id>",
		<asset_name>= "rbxassetid://<asset__id>",
	},
	Sound = {
		<asset_name>= "rbxassetid://<asset__id>",
	},
}