Support Keras 3 with TF backend

[haifeng-jin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 99.14530% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 99.63%. Comparing base (ec4ebd1) to head (87774e6).

❗ Current head 87774e6 differs from pull request most recent head 11d9b77. Consider uploading reports for the commit 11d9b77 to get more accurate results

Files	Patch %	Lines
autokeras/utils/data_utils.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1908       +/-   ##
===========================================
+ Coverage        0   99.63%   +99.63%     
===========================================
  Files           0       48       +48     
  Lines           0     2174     +2174     
===========================================
+ Hits            0     2166     +2166     
- Misses          0        8        +8     

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