option to specify the tsconfig.json in svelte-package

[DetachHead]

Describe the problem

i like to have a seperate tsconfig file for my svelte code to isolate it from the rest of the project, however svelte-package does not seem to have an option to specify the path to the tsconfig.json

Describe the proposed solution

a --tsconfig option like in svelte-check

Alternatives considered

No response

Importance

would make my life easier

Additional Information

i think it currently gets confused when there are multiple tsconfigs in the project. see #9372