Add template deduction guide for Slice constructor #5743

Job	Run time
Bazel on ${{ (((matrix.os == 'ubuntu') && 'Linux') \|\| ((matrix.os == 'macos') && 'macOS') \|\| ((matrix.os == 'windows') && 'Windows') \|\| '???') }}	0s
Clippy	0s
Clang Tidy	0s
ESLint	0s
Outdated	0s
Reindeer	0s
pre_ci / pre_ci	3s
Documentation	26s
Minimal versions	21s
Rust nightly	59s
Rust beta	49s
Rust stable	42s
Rust 1.82.0	49s
Rust 1.77.0	1m 22s
Rust 1.74.0	32s
Rust 1.73.0	30s
Cargo on macOS	1m 1s
Cargo on Windows (msvc)	1m 28s
C++14	57s
C++17	1m 1s
C++20	1m 3s
	12m 3s

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