Update output_padding argument in convolution transpose layer

[sonali-kumari1]

• Added output_padding Argument in Conv1DTranspose, Conv2DTranspose, and Conv3DTranspose layers, which was previously missing in the constructors of these layers.

• Improved description of dilation_rate argument.

• Added allow_zero=True as an extra argument to standardize_tuple() in BaseConvTranspose

• The documentation for Conv1DTranspose, Conv2DTranspose, and Conv3DTranspose layers has been updated to include the output_padding argument.

Fixes #19870 and #20408

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.67%. Comparing base (764ed95) to head (9b8871d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21383   +/-   ##
=======================================
  Coverage   82.67%   82.67%           
=======================================
  Files         565      565           
  Lines       55064    55064           
  Branches     8569     8569           
=======================================
  Hits        45525    45525           
  Misses       7441     7441           
  Partials     2098     2098           

Flag	Coverage Δ
keras	82.48% <ø> (ø)
keras-jax	63.50% <ø> (ø)
keras-numpy	58.67% <ø> (ø)
keras-openvino	33.45% <ø> (ø)
keras-tensorflow	63.91% <ø> (ø)
keras-torch	63.53% <ø> (ø)

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