**Description**

`BigQueryInsertJobOperator` requires the submission of a `configuration` parameter in the form of a dict.  Unfortunately, if this contains a large SQL query - especially one that is formatted with new lines - then this cannot currently be rendered very nicely in the UI.

<img width="1670" alt="Screenshot 2021-07-15 at 15 39 33" src="https://user-images.githubusercontent.com/967119/125806943-839d57a9-d4a0-492d-b130-06432b095239.png">

**Use case / motivation**

The issue with this is that it's impossible to copy and paste the rendered query out of the Airflow UI, into a BigQuery browser and run it without lots of manual edits which is time wasted when troubleshooting problems.

**Are you willing to submit a PR?**

Yes.  My current thought process around this would be to add an optional SQL parameter to the operator which, if provided, would be added into the configuration and could therefore have its own template field and SQL renderer.

e.g.

<img width="1570" alt="Screenshot 2021-07-14 at 14 18 09" src="https://user-images.githubusercontent.com/967119/125808200-5f30b8f4-4def-48a7-8223-82afdc65c973.png">


airflow/providers/google/cloud/operators/bigquery.py
#
#
#
"""This module contains Google BigQuery operators."""
import enum
import hashlib
import json
import re
import uuid
import warnings
from datetime import datetime
from typing import Any, Dict, Iterable, List, Optional, Sequence, Set, SupportsAbs, Union
import attr
from google.api_core.exceptions import Conflict
from google.cloud.bigquery import TableReference
from airflow.exceptions import AirflowException
from airflow.models import BaseOperator, BaseOperatorLink
from airflow.models.taskinstance import TaskInstance
from airflow.operators.sql import SQLCheckOperator, SQLIntervalCheckOperator, SQLValueCheckOperator
from airflow.providers.google.cloud.hooks.bigquery import BigQueryHook, BigQueryJob
from airflow.providers.google.cloud.hooks.gcs import GCSHook, _parse_gcs_url
BIGQUERY_JOB_DETAILS_LINK_FMT = "https://console.cloud.google.com/bigquery?j={job_id}"
_DEPRECATION_MSG = (
    "The bigquery_conn_id parameter has been deprecated. You should pass the gcp_conn_id parameter."
)
class BigQueryUIColors(enum.Enum):