Add compatibility for rest of dbt-utils

[jtcohen6]

Macros that need reimplementing:

• get_url_parameter: This is actually a fix for split_part, which should only add escape characters (\\) if the delimiter needs escaping. Fix: More dbt-utils support #8
• get_relations_by_prefix_sql, get_tables_by_pattern_sql, get_tables_by_prefix, get_tables_by_pattern: Need rethinking. Spark doesn't have a way of querying an information_schema, only show/describe commands—which do have access to regex-y like but cannot be chained/unioned together. Fix: Some dbt_utils.get_relations_by_* macros #10

Integration tests currently failing for macros that otherwise work:

• test_groupby: Star (*) is not allowed in select list when GROUP BY ordinal position is used;
• test_recency: This is a product of how the integration test is currently written, will be fixed by Add sequential values test dbt-utils#318
• test_get_relations_by_pattern: Requires support for schema patterns, which spark_utils.get_relations_by_pattern doesn't (yet) offer
• test_equal_column_subset: A minor bug with dbt_utils.equality when used with an ephemeral model + an explicit column subset. Fix: Fix equality test with ephemeral model + explicit column set dbt-utils#321
• assert_get_query_results_as_dict_objects_equal: The query is not ordered. The way the test is written, if the order in expected_dictionary differs from actual_dictionary, the test fails. Fix: Fix: get_query_results_as_dict integration test dbt-utils#322