refactor(interactive): Refine Interactive SDK documentation

[zhanglei1949]

The existing documentation lacks guides for users to initiate interactivity from the beginning, and the wrapper interfaces are not povided.

• Add getting started (deploy, connect, create graph, bulk loading and submit query)
• Add documentation for each wrapped sdk method.
• Reuse the documentation for models.
• Give a runnable example for each api.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 46.21%. Comparing base (36785af) to head (4cee66e).
Report is 24 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3978   +/-   ##
=======================================
  Coverage   46.21%   46.21%           
=======================================
  Files         174      174           
  Lines       16176    16176           
=======================================
  Hits         7476     7476           
  Misses       8700     8700           

Files	Coverage Δ
...on/graphscope/flex/rest/models/create_edge_type.py	0.00% <0.00%> (ø)
python/graphscope/flex/rest/models/edge_mapping.py	0.00% <0.00%> (ø)
...thon/graphscope/flex/rest/models/vertex_mapping.py	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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