first try of Space and Dimensions

[ytdHuang]

Description

Just make a draft PR and show some basic trials I've done.

Also, for me to find the difference between the original and modified codes, to make the debugging faster.

[codecov]

Codecov Report

Attention: Patch coverage is 95.97315% with 6 lines in your changes missing coverage. Please review.

Project coverage is 88.00%. Comparing base (270d3f6) to head (2930089).
Report is 16 commits behind head on dev/dimensions.

Files with missing lines	Patch %	Lines
src/qobj/functions.jl	57.14%	3 Missing ⚠️
src/qobj/quantum_object_base.jl	90.90%	2 Missing ⚠️
src/qobj/arithmetic_and_attributes.jl	96.66%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (270d3f6) and HEAD (2930089). Click for more details.

HEAD has 4 uploads less than BASE

Flag	BASE (270d3f6)	HEAD (2930089)
	11	7

Additional details and impacted files

@@                Coverage Diff                 @@
##           dev/dimensions     #359      +/-   ##
==================================================
- Coverage           93.14%   88.00%   -5.15%     
==================================================
  Files                  41       43       +2     
  Lines                2684     2767      +83     
==================================================
- Hits                 2500     2435      -65     
- Misses                184      332     +148     

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