ID in toastr container

### Issue type

**I'm submitting a

* [ ] bug report
* [ ] feature request
* [x] Question

### Issue description

**Current behavior:**
How can i add ID's into toasts ? My QA wants to test the toasts and need the ID, how can i set it ?
**Related code:**

### Other information:

**npm, node, OS, Browser**
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**Angular, Nebular**
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