add support to provide custom port in pgvector

[shaharuk-yb]

Few Postgres databases like YugabyteDB use other than 5432 port for databases. For example, Yugabyte uses 5433 port instead of the traditional 5432. This pull request adds provision to use other than default port.

[shaharuk-yb]

/assign @XuanYang-cn

[sre-ci-robot]

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This pull-request has been approved by: alwayslove2013, shaharuk-yb
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