## Problem
Currently, even if `LAMBDA_REMOTE_DOCKER=1`, we unzip the zip files in the directory they are in, which is usually /var/lib/localstack, which usually has a bind mount to the host.
On docker desktop, due to the use of grpc-FUSE (on macos), this can be very slow, about 200 times slower than on volumes / directly on the host. With experimental virtio filesystem enabled (also on macos), this can be reduced to about 30 times as slow, but still problematic.
This means a lambda may take a lot of time processing, for each additional layer some more. This especially affects nodejs lambdas with huge node_modules folders.

## Probable solution
At least if `LAMBDA_REMOTE_DOCKER=1`, we should leave the initial zip files on the bind mount (for persistence etc), but the working directories after unzipping should be located on non-bind mounts, to speed up the IO for unzipping.
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    def test_get_event_source_mapping(self):
        region = lambda_api.LambdaRegion.get()
        with self.app.test_request_context():
            region.event_source_mappings.append({"UUID": self.TEST_UUID})
            result = lambda_api.get_event_source_mapping(self.TEST_UUID)
            self.assertEqual(self.TEST_UUID, json.loads(result.get_data()).get("UUID"))
    def test_get_event_sources(self):
        region = lambda_api.LambdaRegion.get()
        with self.app.test_request_context():
            region.event_source_mappings.append(
                {"UUID": self.TEST_UUID, "EventSourceArn": "the_arn"}
            )
            
            result = lambda_api.get_event_sources(source_arn="the_arn")
            self.assertEqual(1, len(result))
            self.assertEqual(self.TEST_UUID, result[0].get("UUID"))
            
            result = lambda_api.get_event_sources(source_arn="the_")
            self.assertEqual(0, len(result))
    def test_get_event_sources_with_paths(self):
        region = lambda_api.LambdaRegion.get()
        with self.app.test_request_context():
            region.event_source_mappings.append(
                {"UUID": self.TEST_UUID, "EventSourceArn": "the_arn/path/subpath"}
            )
            
            result = lambda_api.get_event_sources(source_arn="the_arn")
            self.assertEqual(1, len(result))
            result = lambda_api.get_event_sources(source_arn="the_arn/path")