extras: add vllm,bark,vall-e-x tests, bump diffusers (#1422)

* tests: add vllm

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

* tests: Add vall-e-x tests

* Add bark tests

* bump diffusers

---------

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

backend/python/bark/test.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+##
+## A bash script wrapper that runs the bark server with conda
+
+# Activate conda environment
+source activate ttsbark
+
+# get the directory where the bash script is located
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+python -m unittest $DIR/test.py