[#490] Enable loan_slice APIs in CXX bindings #1792

Job	Run time
changes	6s
preflight-check	10s
linting-markdown	0s
cargo-nextest (windows-latest)	42s
static-code-analysis-cpp	3m 33s
cargo-nextest (ubuntu-latest)	15s
static-code-analysis-rust (windows-latest)	45s
static-code-analysis-rust (ubuntu-latest)	59s
cargo-nextest (macos-latest)	13s
static-code-analysis-rust (macOS-latest)	42s
static-code-analysis	0s
freebsd	0s
x86_32	0s
grcov	0s
x86_64	0s
x86_64_bazel	0s
x86_64_unstable	0s
coverage	0s
	7m 25s

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