[api] Fixes IdEmbedding memory leak

[frankfliu]

Fixes: #3251

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 72.42%. Comparing base (bd7f4ca) to head (6beb95c).
Report is 12 commits behind head on master.

Files	Patch %	Lines
...c/main/java/ai/djl/nn/transformer/IdEmbedding.java	0.00%	9 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3257      +/-   ##
============================================
+ Coverage     64.26%   72.42%   +8.16%     
- Complexity     6455     7328     +873     
============================================
  Files           676      677       +1     
  Lines         32443    32512      +69     
  Branches       3417     3430      +13     
============================================
+ Hits          20849    23547    +2698     
+ Misses        10016     7350    -2666     
- Partials       1578     1615      +37     

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