Make print macro consistent to dbt Core

[yu-iskw]

Solves #869

I don't want to wrap string with single quotes. If we print out a JSON object or a YAML object, it is hassle to parse the resulting output.

{% macro test_tojson() %}
    {% set x = tojson({"x": "y", "z": ["a", "b", "c"]}) %}
    {{ print(x) }}
{% endmacro %}

# print out
$ dbtf --quiet run-operation test_tojson
'{"x":"y","z":["a","b","c"]}'

# Parse the output of dbt Core with jq
$ dbt --quiet run-operation test_tojson | jq -r '.'

{
  "x": "y",
  "z": [
    "a",
    "b",
    "c"
  ]
}

# Parse the output of dbt Fusion with jq
$ dbtf --quiet run-operation test_tojson | jq -r '.'

jq: parse error: Invalid numeric literal at line 1, column 2

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[yu-iskw]

@dbeatty10 I am sorry for bothering you, but I appreciate if you look into it. Thank you.