`seismology` __repr__ doesnt put the mission identifier before the ID

When calling the repr of the seismology module, the ID appears as:

Seismology(ID: 441462736)

as opposed to the repr for a periodogram or lightcurve object, that would appear as

TessLightCurve(TICID: 441462736)

Specifying the mission ID in Seismology would help alleviate some confusion, but it is a minor issue.

[gully]

A bonus here is that users can override the label, so you can do clarify experiments with:

lc_unlabeled.label = 'V827 Tau with 6 pixel aperture'
lc_unlabeled.normalize().to_periodogram().flatten().to_seismology()

and get: Seismology(Source: V827 Tau with 6 pixel aperture) - no values have been computed so far.

[barentsen]

I like this! We should consistently use the label attribute to label data products, even if custom objects may not have it set.

Minor caveat: LombScarglePeriodogram(Source: None) suggests that the periodogram contains “no source”, so you may want to re-word that slightly, e.g. ID: None may be less confusing?