dev(hansbug): fix support of rise and subside for namedtuple

[HansBug]

from collections import namedtuple

from treevalue import FastTreeValue, subside, rise

nt = namedtuple('nt', ['a', 'b', 'c'])

if __name__ == '__main__':
    a = nt(
        FastTreeValue({'x': 1, 'y': 2, 'z': {'v': 3}}),
        FastTreeValue({'x': 4, 'y': 5, 'z': {'v': 6}}),
        FastTreeValue({'x': 7, 'y': 8, 'z': {'v': 9}}),
    )
    t = subside(a)
    print(t)

    origin = rise(t)
    print(origin)

The output should be

<FastTreeValue 0x7f612b92fc90>
├── 'x' --> nt(a=1, b=4, c=7)
├── 'y' --> nt(a=2, b=5, c=8)
└── 'z' --> <FastTreeValue 0x7f612b92fe50>
    └── 'v' --> nt(a=3, b=6, c=9)

nt(a=<FastTreeValue 0x7f612b92fdd0>
├── 'x' --> 1
├── 'y' --> 2
└── 'z' --> <FastTreeValue 0x7f612b92fd10>
    └── 'v' --> 3
, b=<FastTreeValue 0x7f612b92fa50>
├── 'x' --> 4
├── 'y' --> 5
└── 'z' --> <FastTreeValue 0x7f612b92f9d0>
    └── 'v' --> 6
, c=<FastTreeValue 0x7f612b92f910>
├── 'x' --> 7
├── 'y' --> 8
└── 'z' --> <FastTreeValue 0x7f612b92f890>
    └── 'v' --> 9
)

[codecov]

Codecov Report

Merging #76 (be32736) into main (d99d476) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   99.01%   99.01%           
=======================================
  Files          36       36           
  Lines        2537     2544    +7     
=======================================
+ Hits         2512     2519    +7     
  Misses         25       25           

Flag	Coverage Δ
unittests	99.01% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
treevalue/tree/tree/structural.pyx	100.00% <100.00%> (ø)

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