refactor(stackable-versioned): Move preserve_module into options()

[Techassi]

Part of stackabletech/issues#642

This PR unifies the option interface and moves the preserve_module option (which is only available when the macro is used on modules) into the list of options().

Before

#[versioned(  version(name = "v1alpha1"),  preserve_module )] mod versioned { pub struct Foo { bar: Option<u16>, } }

After

#[versioned(  version(name = "v1alpha1"),  options(preserve_module) )] mod versioned { pub struct Foo { bar: Option<u16>, } }

[NickLarsenNZ]

LGTM