Add Statistical Functions to Paddle Backend

[MahmoudAshraf97]

Add Statistical Functions to Paddle backend

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Please keep in mind that the proper way to link an issue to this list is to comment "- [ ] #issue_number" while the issue's title only includes the name of the function you've chosen.

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• min #10760
• max #10807
• mean #10852
• prod #10868
• std #10873
• sum #10874
• var #10875
• cumprod #13078
• cumsum
• einsum

Experimental

• median
• nanmean #10923
• quantile #10932
• corrcoef #23384
• nanmedian #14694
• unravel_index #11058

The main file paths where these functions are likely to be added are:

• ivy/functional/backends/paddle/statistical.py
• ivy/functional/backends/paddle/experimental/statistical.py

[rogn02]

• einsum #21009

[MaxRiabytsia]

cumsum #23437

[SherjeelAhmed]

#23511

[AjayDyavathi]

corrcoef #23384

[Moshood-Wale]

#26066