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