make Bound and Borrowed types public API #7782

Job	Run time
fmt	16s
test-debug	9m 12s
emscripten	0s
check-msrv	6m 41s
semver-checks	20s
valgrind	0s
clippy/x86_64-apple-darwin/stable	10m 30s
coverage-windows	8s
clippy/x86_64-unknown-linux-gnu/stable	8m 41s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
coverage-macos	8s
clippy/powerpc64le-unknown-linux-gnu/stable	7m 47s
coverage-ubuntu	12m 46s
clippy/s390x-unknown-linux-gnu/stable	7m 51s
clippy/wasm32-wasi/stable	7m 42s
careful	0s
clippy/x86_64-pc-windows-msvc/stable	13m 48s
clippy/i686-pc-windows-msvc/stable	11m 33s
clippy/x86_64-unknown-linux-gnu/beta	8m 6s
python3.12-x64 ubuntu-latest rust-stable / build	6m 38s
python3.12-x64 windows-latest rust-stable / build	10m 22s
python3.12-x86 windows-latest rust-stable / build	7m 35s
python3.12-x64 macos-latest rust-stable / build	9m 51s
python3.12-x64 ubuntu-latest rust-nightly / build	6m 14s
conclusion	1s
	2h 26m 10s

Provide feedback