AI is a hot topic in Cloud Native environments (not only there).
Providing a way to easily add `pgvector` to CloudNativePG deployments
can potentially increase the adoption of Postgres in these contexts.
It is an extension that can be fully controlled by a standard Postgres
user, like the application user in CloudNativePG, without requiring
any settings in shared_preload_libraries.
License-wise that extension creates no problems.
Closes#70
Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>