Add the declarations file for PyTorch 2.3. #941

Job	Run time
Rustfmt	20s
Test Suite (ubuntu-latest, stable)	1m 52s
Clippy	1m 1s
Test Suite (ubuntu-latest, nightly)	1m 51s
Check (ubuntu-latest, stable)	1m 23s
Test Suite (macOS-latest, stable)	3m 57s
Check (ubuntu-latest, nightly)	1m 18s
Test Suite (macOS-latest, nightly)	7m 39s
Check (windows-2019, stable)	1m 57s
Check (windows-2019, nightly)	1m 57s
Check (macOS-latest, stable)	1m 44s
Check (macOS-latest, nightly)	1m 41s
	26m 40s

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