[GAE-Java] GraphX-on-GraphScope : remove `GraphXFragment` and related components

[zhanglei1949]

What do these changes do?

Background

The original GraphX-on-GraphScope implementation support both GraphXFragment And ArrowProjectedFragment. Relying on two storage structure introducing unnecessary complexity and GraphXFragment doesn't differ much from ArrowProjectedFragment from a design point of view . So in this PR, we remove GraphXFragment and related components, and refactor Graphx-on-GraphScope to adapt this change.

[codecov-commenter]

Codecov Report

Merging #2123 (c22f099) into main (49ae814) will decrease coverage by 1.22%. The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2123      +/-   ##
==========================================
- Coverage   72.93%   71.71%   -1.23%     
==========================================
  Files          89       89              
  Lines        9789     9789              
==========================================
- Hits         7140     7020     -120     
- Misses       2649     2769     +120     

Impacted Files	Coverage Δ
python/graphscope/tests/unittest/test_java_app.py	53.01% <0.00%> (-46.99%)	:arrow_down:
python/graphscope/analytical/app/java_app.py	24.36% <0.00%> (-27.92%)	:arrow_down:
python/graphscope/client/rpc.py	83.20% <0.00%> (-3.06%)	:arrow_down:
python/graphscope/framework/graph_utils.py	80.15% <0.00%> (-2.39%)	:arrow_down:
python/graphscope/client/session.py	74.95% <0.00%> (-1.52%)	:arrow_down:
python/graphscope/framework/app.py	90.32% <0.00%> (-1.39%)	:arrow_down:
python/graphscope/framework/utils.py	66.40% <0.00%> (-1.05%)	:arrow_down:
python/graphscope/framework/graph_schema.py	64.61% <0.00%> (-0.23%)	:arrow_down:

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