add example to call oncat tool

import os

import re

from bioblend import galaxy

from bioblend.galaxy.tools.inputs import inputs

galaxy_url = os.getenv("GALAXY_URL")

galaxy_user_api_key = os.getenv("GALAXY_API_KEY")

# connect to a Galaxy instance, create dataset client

galaxy_instance = galaxy.GalaxyInstance(url=galaxy_url, key=galaxy_user_api_key)

dataset_client = galaxy.datasets.DatasetClient(galaxy_instance)

# get active history id

history_id = galaxy_instance.histories.get_histories()[0]["id"]

tool_inputs = inputs()\

    .set("facility", "SNS")\

    .set("instrument", "ARCS")\

    .set("ipts", "28935")\

    .set("run", 243817)

res = galaxy_instance.tools.run_tool(history_id, 'neutrons_import_oncat', tool_inputs)['outputs'][0]

result_dataset_id = res['id']

dataset_client.wait_for_dataset(result_dataset_id)

# export results

outname = re.sub('\W', '_', res["name"]+"."+res["file_ext"])

exported_data = dataset_client.download_dataset(dataset_id=result_dataset_id,

                                                file_path=outname,

                                                use_default_filename=False)