New lazy_value for parametrize_plus

[smarie]

Fixes #92

[codecov-commenter]

Codecov Report

Merging #95 into master will increase coverage by 0.25%.
The diff coverage is 91.22%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   88.55%   88.81%   +0.25%     
==========================================
  Files          71       78       +7     
  Lines        2831     3101     +270     
==========================================
+ Hits         2507     2754     +247     
- Misses        324      347      +23     

Impacted Files	Coverage Δ
...ension/parametrize_plus/test_fixture_ref_basic1.py	100.00% <ø> (ø)
...ension/parametrize_plus/test_fixture_ref_basic2.py	100.00% <ø> (ø)
...parametrize_plus/test_fixture_ref_basic3_tuples.py	100.00% <ø> (ø)
...on/parametrize_plus/test_fixture_ref_basic4_ids.py	100.00% <ø> (ø)
...nsion/parametrize_plus/test_fixture_ref_custom1.py	100.00% <ø> (ø)
...nsion/parametrize_plus/test_fixture_ref_custom2.py	92.85% <ø> (ø)
...nsion/parametrize_plus/test_fixture_ref_custom3.py	100.00% <ø> (ø)
...ests/pytest_extension/parametrize_plus/test_so2.py	100.00% <ø> (ø)
...est_extension/parametrize_plus/test_so2_dynamic.py	100.00% <ø> (ø)
..._extension/parametrize_plus/test_so2_simplified.py	100.00% <ø> (ø)
... and 22 more

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