Add test for list_nested_decimal

[ariesdevil]

Add test for list_nested_decimal, the data structure is:

[
    [[Decimal(0), Decimal(1)]],
    None,
    [[Decimal(2), None], [Decimal(3)]],
    [[Decimal(4), Decimal(5)], [Decimal(6)]],
    [],
    [[Decimal(7)], None, [Decimal(9)]],
    [[], [None], None],
    [[Decimal(10)]],
]

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8880501) 83.06% compared to head (d46eabc) 83.05%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1572      +/-   ##
==========================================
- Coverage   83.06%   83.05%   -0.01%     
==========================================
  Files         391      391              
  Lines       42898    42898              
==========================================
- Hits        35632    35631       -1     
- Misses       7266     7267       +1     

see 4 files with indirect coverage changes

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