New API to get the initial bounds of entities

When we open a map, the map core needs to get the initial bounds of map view for the opening entity, for example: the wallet, current we are using a legacy API to do it, you can find it in the page: https://beta-map.treetracker.org/wallets/heveya.replant.world The algorithm for this is inaccurate, we need to develop a better way to get the initial view, before, we are using the cluster data to get the best center + zoom level, but sometimes the cluster data is not so good, and the center+zoom level is also not so good, maybe we can draw a rectangle for all tree points and get the direct bounds (coordinates of the two corners) because the new lib leaflet support it (direct jump to a bounds)

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