[AINode] Update the class fields of IoTDB dataset

[CRZbulabula]

The seq_len, input_token_len and output_token_len are required by each model, hence we clear up the class fields of dataset in this PR.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 39.11%. Comparing base (71563ed) to head (201c30e). Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #15799      +/-   ##
============================================
- Coverage     39.11%   39.11%   -0.01%     
  Complexity      198      198              
============================================
  Files          4837     4837              
  Lines        314760   314760              
  Branches      39516    39516              
============================================
- Hits         123122   123121       -1     
- Misses       191638   191639       +1     

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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