Feat/add support for numpy datatypes in tokensloader

[bhimrazy]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #400.

• Feature: Add support for numpy datatypes in TokensLoader

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78%. Comparing base (73f767f) to head (69719df).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #401   +/-   ##
===================================
  Coverage    78%    78%           
===================================
  Files        34     34           
  Lines      5045   5052    +7     
===================================
+ Hits       3954   3960    +6     
- Misses     1091   1092    +1     

[tchaton]

Looks great !