Implement TDBID ToStringDEBUG

[Roms1383]

Add support for gamedataTDBIDHelper#ToStringDEBUG and impl Display for TweakDbId.

[Roms1383]

One optional thing to avoid forcing conditional compilation for to_string_debug on downstream plugins
is to create a test only variant for InvokeError:

#[cfg(test)]
#[cfg_attr(test, error("unsupported in this context: {0}"))]
UnsupportedContext(&'static str),

And have to_string_debug returns it automatically on #[cfg(test)].
Not sure how much you like this approach @jac3km4.