Temporal layers indicators

[Samweli]

Adds support for the temporal layers indicators in the Layers panel work tree.

These indicators change depending on from where the current layers temporal range is set from, eg from the project settings or from layer temporal properties options.

This PR contains work from #34590

Note: This is part of the work from discussions found here and here .

[nyalldawson]

Looking close!

Now that QgsTemporalProperty/QgsMapLayerTemporalProperties/QgsRasterLayerTemporalProperties are QObjects, you'll need to ensure these all have the Q_OBJECT macro inclusion, and also accept a parent QObject* argument in their constructors.

Then, we need to make sure that the QgsRasterLayerTemporalProperties are correctly parented to the raster layer when constructed. So in qgsrasterlayer.cpp

mTemporalProperties = qgis::make_unique<QgsRasterLayerTemporalProperties>();

becomes

mTemporalProperties =  new QgsRasterLayerTemporalProperties( this );

You'll also need to change

std::unique_ptr< QgsRasterLayerTemporalProperties > mTemporalProperties;

to

QgsRasterLayerTemporalProperties * mTemporalProperties = nullptr;

in the header, since we'll be using Qt's parent memory management instead of c++ unique_ptr

[nyalldawson]

Looks great, thanks!

[nyalldawson]

Can you rebase this branch off master? There's a merge conflict here.

[Samweli]

Can you rebase this branch off master? There's a merge conflict here.

Sure, done!

[nyalldawson]

Thanks -- I'll merge as soon as the CI results are green!

[Samweli]

Thanks @nyalldawson