Update Parquet and remove diagTree, ExprTree, and old parquet_builder

[houpc]

1. Remove DiagTree and ExprTree Modules.
2. Update the Parquet module in src/frontend/parquet/ & Remove src/parquet_builder.
3. Remove the factor field in AbstractGraph type.
4. Relocation of DiagPara to Parquet Module.

[codecov-commenter]

Codecov Report

Attention: 222 lines in your changes are missing coverage. Please review.

Comparison is base (1624693) 57.95% compared to head (286cbbc) 56.11%.
Report is 6 commits behind head on computgraph.

Files	Patch %	Lines
src/computational_graph/transform.jl	1.63%	60 Missing ⚠️
src/frontend/parquet/diagram_id.jl	41.37%	34 Missing ⚠️
src/frontend/parquet/operation.jl	50.81%	30 Missing ⚠️
src/backend/to_dot.jl	0.00%	23 Missing ⚠️
src/frontend/parquet/common.jl	68.85%	19 Missing ⚠️
src/frontend/parquet/parquet.jl	56.25%	14 Missing ⚠️
src/frontend/parquet/ep_coupling.jl	0.00%	12 Missing ⚠️
src/backend/compiler_python.jl	0.00%	6 Missing ⚠️
src/frontend/parquet/sigmaGV.jl	0.00%	6 Missing ⚠️
src/utility.jl	58.33%	5 Missing ⚠️
... and 8 more

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Additional details and impacted files

@@               Coverage Diff               @@
##           computgraph     #172      +/-   ##
===============================================
- Coverage        57.95%   56.11%   -1.84%     
===============================================
  Files               67       51      -16     
  Lines             5294     4496     -798     
===============================================
- Hits              3068     2523     -545     
+ Misses            2226     1973     -253     

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