fix(interactive): fix ldbc data importing in Groot

[BingqingLyu]

What do these changes do?

1. Fix in ldbc schema
2. When importing the data, do not convert empty string to nan

Related issue number

#4581

[github-actions]

Please check the preview of the documentation changes at
https://a6e4f3ca.graphscope-docs-preview.pages.dev

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.02%. Comparing base (5bcefbd) to head (eba64e7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4583      +/-   ##
==========================================
- Coverage   35.01%   33.02%   -2.00%     
==========================================
  Files         127      127              
  Lines       13299    13299              
==========================================
- Hits         4657     4392     -265     
- Misses       8642     8907     +265     

see 12 files with indirect coverage changes

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[github-actions]

/cc @yecol @sighingnow, this issus/pr has had no activity for a long time, please help to review the status and assign people to work on it.