test(tiny-react): fuzzing reconciler

[hi-ogawa]

This would make me feel less nervous about making changes such as

• refactor(tiny-react): handle children re-insertion in fragment reconcilation #169

todo

• nested fragment shuffle
• memo
  • turns out memo is still broken after fix(tiny-react): fix memo #168
  • hopefully it will be finally fixed by perf(tiny-react): render optimization for "identical vnode" + fix memo #173
• non full key case

For starter, basic case is enough so merging as is.