Multi identify for mesh layer (#37916)

[QGIS-feature-tracker]

Original commit: qgis/QGIS@282d5f9 by web-flow

[FEATURE] map tool identify for mesh layer with displaying the dataset value corresponding of the current time of the temporal controller for all dataset groups

This PR changes the map tool identify for mesh layer with displaying the dataset value corresponding of the current time of the temporal controller for all dataset groups. The active dataset groups (scalar and eventually vector) are first displayed, then the other dataset groups.
There is also other information displayed:

• Source : where the dataset is stored
• Time step : the time step of the dataset that is displayed (can be different than the time of the temporal controller), nothing if the dataset group is non temporal
• centroid of the corresponding face
• coordinate of the snapped vertex (if one is snapped)
• center of the snapped edge (if one is snapped)

When the map canvas is non temporal (temporal navigation disabled), the identify results contain only information about the active dataset groups that are the only dataset groups that have static dataset defined in the mesh properties dialog.