Add alias forwarding internal `@nanobind` to users #158

Job	Run time
Lint Bazel files with buildifier	6s
Test nanobind_example on ubuntu-latest w/ Python 3.8	24s
Test nanobind_example on ubuntu-latest w/ Python 3.9	25s
Test nanobind_example on ubuntu-latest w/ Python 3.10	27s
Test nanobind_example on ubuntu-latest w/ Python 3.11	25s
Test nanobind_example on ubuntu-latest w/ Python 3.12	37s
Test nanobind_example on ubuntu-latest w/ Python 3.13	40s
Test nanobind_example on macos-latest w/ Python 3.8	55s
Test nanobind_example on macos-latest w/ Python 3.9	1m 9s
Test nanobind_example on macos-latest w/ Python 3.10	56s
Test nanobind_example on macos-latest w/ Python 3.11	1m 25s
Test nanobind_example on macos-latest w/ Python 3.12	1m 10s
Test nanobind_example on macos-latest w/ Python 3.13	1m 11s
Test nanobind_example on windows-latest w/ Python 3.8	3m 56s
Test nanobind_example on windows-latest w/ Python 3.9	2m 17s
Test nanobind_example on windows-latest w/ Python 3.10	2m 25s
Test nanobind_example on windows-latest w/ Python 3.11	2m 9s
Test nanobind_example on windows-latest w/ Python 3.12	2m 54s
Test nanobind_example on windows-latest w/ Python 3.13	3m 26s
	26m 57s

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