Add special openPopup and openTooltip methods to FeatureLayer

This should fix the issue with FeatureLayer.bindPopup() and FeatureLayer.bindTooltip() introduced with Leaflet 1.9.3.

The solution was to just copy the methods but remove the logic around FeatureGroup.

RE: #1348, https://github.com/Leaflet/Leaflet/issues/8761

Can be tested locally in the debug folder with:

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8" />
  <title>Esri Leaflet Debugging Sample</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />

  <link rel="stylesheet" href="https://unpkg.com/leaflet@1/dist/leaflet.css" />
  <script src="https://unpkg.com/leaflet@1.9.3"></script>

  <!-- Load Esri Leaflet from source-->
  <script src="../dist/esri-leaflet-debug.js"></script>

  <style>
    body {
      margin: 0;
      padding: 0;
    }

    #map {
      position: absolute;
      top: 0;
      bottom: 0;
      right: 0;
      left: 0;
    }

    #info-pane {
      position: absolute;
      top: 10px;
      right: 10px;
      z-index: 1000;
      padding: 1em;
      background: white;
    }
  </style>
</head>

<body>
  <div id="map"></div>
  <div id="info-pane" class="leaflet-bar">
    <label>
      sample application for debugging
    </label>
  </div>

  <script>
    /*
  make a copy of this file in the same folder if you'd like git to ignore your local changes
  */
    var map = L.map("map").setView([43.5, -98.5], 6);

    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
      attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
    }).addTo(map);

    const earthquakes = L.esri
      .featureLayer({
        url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Earthquakes_Since1970/MapServer/0"
      })
      .addTo(map);

    earthquakes.bindPopup(function (layer) {
      return L.Util.template(
        "<p>Earthquake <strong>{name}</strong> occured on {mo}/{dy}/{year_}.  It had a magnitude of {magnitude}.</p>",
        layer.feature.properties
      );
    });

    earthquakes.bindTooltip(function (layer) {
      return L.Util.template(
        "<p>{name}</p>",
        layer.feature.properties
      );
    });
  </script>
</body>

</html>

Esri / esri-leaflet

Add special openPopup and openTooltip methods to FeatureLayer #1350