[Fix] fix dataset_converters scripts int arg passing bug

[Luo-Yihang]

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Motivation

There are several scripts under tools/dataset_converters accpet int arguments, e.g., '--n-thread'. However, some of those arguments are not declared as int explicitly, they will be regarded as str if we pass those arguments to the scripts by ourselves, and therefore generate an error message in the following steps.

Modification

Define the int arguments with type=int explicitly in those buggy scripts under tools/dataset_converters.

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BC-breaking (Optional)

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Use cases (Optional)

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Checklist

Before PR:

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• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
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• The documentation has been modified accordingly, including docstring or example tutorials.

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Codecov Report

Base: 88.97% // Head: 88.97% // No change to project coverage 👍

Coverage data is based on head (c7668bf) compared to base (70aae51).
Patch has no changes to coverable lines.

❗ Current head c7668bf differs from pull request most recent head 58e7b45. Consider uploading reports for the commit 58e7b45 to get more accurate results

Additional details and impacted files

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  Coverage    88.97%   88.97%           
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  Lines        26083    26083           
  Branches      4044     4044           
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  Hits         23208    23208           
  Misses        1975     1975           
  Partials       900      900           

Flag	Coverage Δ
unittests	88.97% <ø> (ø)

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[Z-Fran]

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