[w3c/IndexedDB] Add caniuse panels (#159)

Once https://github.com/Fyrd/caniuse/issues/3193 is addressed we can tag methods with 
```html
<dfn caniuse="IndexedDB" method for=IDBObjectStore>get(|query|)</dfn> 
```
or
```html
<dfn caniuse="IndexedDB2" method for=IDBObjectStore>getAll(|query|, |count|)</dfn>
```
as appropriate to get helpful boxes showing browser support.

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