adding verification script

[MarkWolters]

This PR adds one new script, verify_native_lib.sh, to the jvector-native module. The purpose of this script is to verify that the libjvector.so shared library has been correctly generated and contains the expected content prior to pushing a release to Sonatype (although it can also be used ad hoc at any time).

This PR contains no code changes or modifications to existing files.

Release instructions at https://github.com/riptano/VECTOR-SEARCH/blob/main/teamdocs/jvector_releases_admin.md have been updated to include a step for this check.

[github-actions]

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[r-devulap]

LGTM.