add an all plaform supported cleanup solution

[Vizonex]

There has been an ongoing issue for users using Windows who try and compile llhttp where the remove command rm wouldn't work (because it doesn't exist on windows) so I came up a logical solution that tries to fix this and hopefully make it so that other users don't fall under the same boat.

fixes #767

[ShogunPanda]

It looks fine to me.
Just two minor things:

1. Can you move it to the scripts folder?
2. Can you make sure it's properly formatted according to our linting rules?

[Vizonex]

I sure can, give me a couple of minutes.

[Vizonex]

@ShogunPanda About what you told me I am in a bit of confusion as to what folder specifically to move this new clean.ts file.

1. Can you move it to the scripts folder?

I had it in the bin folder due to believing it was where such scripts were to be stored but would I be moving this new clean.ts script to the src folder or does this request imply I make a new scripts folder for this specific tool?

[ShogunPanda]

@Vizonex My bad. I meant you to create a new /scripts folder.