Open and parse files lazily#204

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KeiichiHirobe wants to merge 3 commits intorubenv:masterfrom

KeiichiHirobe:lazy-load

Commits on Jan 23, 2022

Open and parse files lazily
KeiichiHirobe
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Commits on Feb 3, 2022

Revert "Open and parse files lazily"
KeiichiHirobe
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Commits on Feb 7, 2022

Add SetLazyLoad option, which sets the boolean to enable migration file to be loaded only when needed.
KeiichiHirobe
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