`dataform format` breaks triple-quoted strings in BigQuery

[desbo]

BigQuery SQL supports triple-quoted strings wrapped in '''.

When running dataform format against a SQLX file containing a triple-quoted string, the quotes are formatted like the below example:

(original)

'''
select 1
'''

(after formatting)

''
'
select 1
'
''

BigQuery fails when executing the query after this formatting change.