[#490] Enable loan_slice APIs in CXX bindings #1791

Job	Run time
changes	5s
preflight-check	11s
linting-markdown	0s
cargo-nextest (windows-latest)	39s
static-code-analysis-cpp	3m 31s
static-code-analysis-rust (windows-latest)	52s
cargo-nextest (ubuntu-latest)	23s
static-code-analysis-rust (ubuntu-latest)	49s
cargo-nextest (macos-latest)	14s
static-code-analysis-rust (macOS-latest)	1m 2s
static-code-analysis	0s
freebsd	0s
grcov	0s
x86_64	0s
x86_32	0s
x86_64_bazel	0s
x86_64_unstable	0s
coverage	0s
	7m 46s

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