Remote Model Loading/Saving + Docstring Fix

[VarunS1997]

• Resolved .h5 vs .keras confusion arising from misleading docstring
• Added functionality to save remote models locally before loading or saving

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 78.81%. Comparing base (dfe8af7) to head (3dcfc57).

Files with missing lines	Patch %	Lines
keras/src/saving/saving_lib.py	20.00%	2 Missing and 2 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20317      +/-   ##
==========================================
- Coverage   78.81%   78.81%   -0.01%     
==========================================
  Files         512      512              
  Lines       49056    49061       +5     
  Branches     9033     9035       +2     
==========================================
+ Hits        38664    38665       +1     
- Misses       8528     8530       +2     
- Partials     1864     1866       +2     

Flag	Coverage Δ
keras	78.67% <20.00%> (-0.01%)	:arrow_down:
keras-jax	62.26% <20.00%> (-0.01%)	:arrow_down:
keras-numpy	57.40% <20.00%> (-0.01%)	:arrow_down:
keras-tensorflow	63.55% <20.00%> (-0.01%)	:arrow_down:
keras-torch	62.25% <20.00%> (-0.01%)	:arrow_down:

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[fchollet]

Fixed here: https://github.com/keras-team/keras/commit/b3e0b46323618cc1cf56715a9b9cf4baf2918a4b