Add Toml comment preservation and header methods

[leonardo-dgs]

Describe the solution you'd like
It would be useful to implement comment preservation and header methods on Toml files.

[KotlinFactory]

Hey Leonardo,

thank you for this idea. Are you able to create a PR for this? It would spare us a lot of time.

Regards,
Leonhard

[leonardo-dgs]

I will see what can I do.

[KotlinFactory]

User didn't respond.

[leonardo-dgs]

User didn't respond.

For now I don't have time, but let this issue open for remainder (that's what are supposed to do).