Add support for Trie.Walk() and Node.SetValue() (#4)

* udpate: add support for SelectOnValue, find item in the tree based on Value, using eval function

* update: renaming, cleaning tests

* update: renaming, SelectOnValue -> Walk, implement with childrenDLL to avoid non deterministic sort.

* Add support for Trie.Walk() and Node.SetValue()

* Fix err on Windows + Fix docs

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Co-authored-by: tophe <[email protected]>
Co-authored-by: Shivam Mamgain <[email protected]>

Minor fixes