Symmetric tree (#9871)

* symmectric tree

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* removed trailing spaces

* escape sequence fix

* added return type

* added class

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* wordings fix

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* added static method

* added type

* added static method

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* wordings fix

* testcase added

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* testcase added for mirror function

* testcase added for mirror function

* made the requested changes

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* made the requested changes

* doc test added for symmetric, asymmetric

* Update symmetric_tree.py

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Co-authored-by: jeevaramanthan.m <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>