Add Power{N} operator in computational graph

[houpc]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 82 lines in your changes are missing coverage. Please review.

Comparison is base (b063a68) 64.79% compared to head (9147ef0) 64.19%.
Report is 1 commits behind head on computgraph.

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Additional details and impacted files

@@               Coverage Diff               @@
##           computgraph     #143      +/-   ##
===============================================
- Coverage        64.79%   64.19%   -0.61%     
===============================================
  Files               56       56              
  Lines             3724     3854     +130     
===============================================
+ Hits              2413     2474      +61     
- Misses            1311     1380      +69     

Files	Coverage Δ
src/computational_graph/optimize.jl	95.17% <100.00%> (ø)
src/computational_graph/abstractgraph.jl	75.60% <83.33%> (+1.32%)	⬆️
src/computational_graph/feynmangraph.jl	91.17% <93.75%> (-0.28%)	⬇️
src/computational_graph/eval.jl	77.77% <0.00%> (-9.73%)	⬇️
src/computational_graph/operation.jl	80.18% <52.50%> (-5.34%)	⬇️
src/computational_graph/graph.jl	70.10% <58.06%> (-15.62%)	⬇️
src/backend/static.jl	38.37% <28.57%> (-3.01%)	⬇️

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[dcerkoney]

Looks good to me

[houpc]

Looks good to me

Thanks. The modification for static compilers has been updated.