Add serialize and deserialize method for graph.

[siyuan0322]

No description provided.

[codecov-io]

Codecov Report

Merging #103 (683054d) into main (15ce6fd) will increase coverage by 0.16%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
+ Coverage   78.14%   78.30%   +0.16%     
==========================================
  Files          50       50              
  Lines        4558     4601      +43     
==========================================
+ Hits         3562     3603      +41     
- Misses        996      998       +2     

Impacted Files	Coverage Δ
python/graphscope/framework/graph.py	92.04% <92.30%> (+0.02%)	⬆️
python/graphscope/deploy/tests/test_demo_script.py	99.17% <100.00%> (+0.13%)	⬆️
python/graphscope/framework/context.py	83.48% <100.00%> (ø)

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[yecol]

Please verify the correctness (or return error messages) for edge cases, e.g.,

• serialized on 2 workers, deserialize from 3 workers.
• serialized on 4 workers, deserialize from another 4 workers, but they sharing the same worker_0
• serialization files are not complete, e.g., in one of the workers, the blob file is missing.
• ...