[rust] Change loging level to debug

[xyang16]

Description

Brief description of what this PR is about

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here

[frankfliu]

1. We should check null for cu122 case at line 162, it will throw and NPE.
2. We should keep it as warning at least. IOException should not happen.

[xyang16]

For cu122, it will not throw NPE. It will throw IOException:

Resource not found in classpath: native/lib/linux-x86_64/cu122/libtokenizers.so

So IOException is expected to happen, then it will proceed to download.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 72.89%. Comparing base (90680b3) to head (0e4b407).
Report is 114 commits behind head on master.

Files with missing lines	Patch %	Lines
...va/ai/djl/huggingface/tokenizers/jni/LibUtils.java	0.00%	2 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3336      +/-   ##
============================================
- Coverage     72.93%   72.89%   -0.05%     
  Complexity     7328     7328              
============================================
  Files           668      668              
  Lines         32415    32443      +28     
  Branches       3418     3428      +10     
============================================
+ Hits          23642    23648       +6     
- Misses         7165     7182      +17     
- Partials       1608     1613       +5     

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