dev(hansbug): add unpack

[HansBug]

Description

from treevalue import FastTreeValue

t1 = FastTreeValue({
    'a': 21, 'b': {'x': 'f-49', 'y': 7.7},
})

print(t1.unpack('a', 'b'))
print(t1.b.unpack('x', 'y'))
print(t1.b.unpack('x', 'y', 'z'))  # KeyError
print(t1.b.unpack('x', 'y', 'z', default=None))

Check List

• merge the latest version source branch/repo, and resolve all the conflicts
• pass style check
• pass all the tests

[codecov]

Codecov Report

Merging #80 (28c99a4) into main (b61551a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   98.95%   98.95%           
=======================================
  Files          39       39           
  Lines        2578     2587    +9     
=======================================
+ Hits         2551     2560    +9     
  Misses         27       27           

Flag	Coverage Δ
unittests	98.95% <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/tree.pyx	99.30% <100.00%> (+0.02%)	⬆️

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