Include YaoPlots as a component package

[GiggleLiu]

List of changes

1. Include YaoPlots as a component package.

The using time increased from 0.68s to 0.9s on my machine.

julia> @time using Yao
  0.901292 seconds (1.28 M allocations: 86.938 MiB, 5.83% gc time, 22.79% compilation time: 94% of which was recompilation)

2. Fixed some of the documentation.

[codecov]

Codecov Report

Attention: 62 lines in your changes are missing coverage. Please review.

Comparison is base (e17a32b) 89.03% compared to head (69f1bf5) 88.75%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
lib/YaoPlots/src/vizcircuit.jl	82.17%	54 Missing ⚠️
src/EasyBuild/block_extension/shortcuts.jl	25.00%	3 Missing ⚠️
lib/YaoPlots/src/bloch.jl	98.03%	2 Missing ⚠️
lib/YaoPlots/src/YaoPlots.jl	66.66%	1 Missing ⚠️
lib/YaoPlots/src/helperblock.jl	94.11%	1 Missing ⚠️
src/EasyBuild/block_extension/FSimGate.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
- Coverage   89.03%   88.75%   -0.29%     
==========================================
  Files          83       87       +4     
  Lines        4835     5264     +429     
==========================================
+ Hits         4305     4672     +367     
- Misses        530      592      +62     

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[GiggleLiu]

The YaoBlocks test breaks on nightly, which is due to an error in Zygote.