jinja whitespace tests

[aldehir]

Moved the testing.h helper out of peg-parser in case it's useful, not really required.

Added whitespace tests, took a few from the Jinja code base and then added one along with the expected string from jinja.h.

Adjusted the spacing rules. The default in Jinja is lstrip_blocks = False and trim_blocks = False. It seems this used to be done in the preprocessing step, but was removed. That's probably fine, I haven't seen a template that adjusts those settings (not sure how they could). These updates should better align to those defaults.

Original:

whitespace
  no whitespace control
  ASSERTION FAILED : Template render mismatch
    Template: "    {% if True %}\n    {% endif %}"
    Expected: "    \n    "
    Actual  : ""
  ASSERTION FAILED : Template render mismatch
    Template: "  {% if kvs %}   {% for k, v in kvs %}{{ k }}={{ v }} {% endfor %}  {% endif %}"
    Expected: "     a=1 b=2   "
    Actual  : "a=1b=2"
  no whitespace control (2 of 2 assertion(s) failed)                            [FAIL]
  leading whitespace control
  ASSERTION FAILED : Template render mismatch
    Template: "  {%- if kvs %}   {%- for k, v in kvs %}{{ k }}={{ v }} {% endfor -%}  {%- endif %}"
    Expected: "a=1 b=2 "
    Actual  : "a=1b=2"
  ASSERTION FAILED : Template render mismatch
    Template: "{{- ']~b[ai' ~ '\\n' }}\n\n{%- set reasoning_content = ''%}"
    Expected: "]~b[ai\n"
    Actual  : "]~b[ai\n\n"
  leading whitespace control (2 of 2 assertion(s) failed)                       [FAIL]
whitespace (4 of 4 assertion(s) failed)                                         [FAIL]

tests      : 3
assertions : 4
failures   : 4
exceptions : 0

With this PR:

whitespace
  no whitespace control
  no whitespace control (2 assertion(s))                                        [PASS]
  leading whitespace control
  leading whitespace control (2 assertion(s))                                   [PASS]
whitespace (4 assertion(s))                                                     [PASS]

tests      : 3
assertions : 4
failures   : 0
exceptions : 0

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