allow user to display more than 15k alerts

[dfguerrerom]

Depending on the number of alerts, the browser could be blocked and the loading wouldn't be efficient due to the alerts are loaded on the client side, as posted in SEPAL openforis/sepal#241, would be nice to find a VectorTiling process and so allow as many alerts as are in the AOI.

In the meanwhile, a workaround would be to limit the number of alerts displayed at the same time with the option to paginate them.