Add additional properties from leaflet to GridLayer

[MixMasterMitch]

This PR adds the following properties from leaflet GridLayer:

• minZoom
• maxZoom
• minNativeZoom
• maxNativeZoom
• keepBuffer

See https://leafletjs.com/reference.html#gridlayer

(I am particularly interested in the maxNativeZoom option to solve the problem described in this SO)

This change has been tested by zooming in on the simple example after applying the following diff:

diff --git a/docs/examples/simple.md b/docs/examples/simple.md
index e6732fc..6266f17 100644
--- a/docs/examples/simple.md
+++ b/docs/examples/simple.md
@@ -21,6 +21,7 @@ pageClass: example-page
     <l-map
       v-if="showMap"
       :zoom="zoom"
+      :max-zoom="25"
       :center="center"
       :options="mapOptions"
       style="height: 80%"
@@ -30,6 +31,8 @@ pageClass: example-page
       <l-tile-layer
         :url="url"
         :attribution="attribution"
+        :max-native-zoom="18"
+        :max-zoom="25"
       />
       <l-marker :lat-lng="withPopup">
         <l-popup>

[MixMasterMitch]

@DonNicoJs or @KoRiGaN, could I please get review of this change?