[feature request] add links between pins in the map view

[Xieleilab]

in obsidian, the links between notes are the important features, so in the mapview, if two notes are linked, the corresponding pins of thses nodes can also be linked by adding a line btween them, just like the OD (origin-destination)graph in the QGIS sofeware, in these cases, the links between nodes can be clearly witnessed in the map! this function is suggested to be added and set to be able to show or hide