feat(examples): calculator realm

[NicolasMelet]

This calculator realm implements a binary tree to compute the result of mathematics expressions.

• Make basic computation possible (+ - / * and decimals)
• store computation functions in a map as lambda
• write tests
• add parenthesis in equation

[Gno2D2]

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[leohhhn]

left a couple of comments. nice work :)

[leohhhn]

Also, please check why the CI is failing

[leohhhn]

Pretty cool; I'll let @thehowl resolve his comments