fix: extension upgrade issue with s3vectors_fdw

[burmecia]

What kind of change does this PR introduce?

This PR is to fix issue when upgrade wrappers extension from 0.5.6 onwards.

What is the current behavior?

In version 0.5.6, s3vectors_fdw defined a custom type embd, some custom functions and a custom operator <==> around that type. The embd type name needs to be changed to s3vec from 0.5.7, but current upgrade sql script cannot handle the upgrade properly.

What is the new behavior?

Drop the custom operator <==> beforehand in the bootstrap sql and added create or replace for the custom functions.

Additional context

N/A

[Copilot]

Pull request overview

This PR addresses an extension upgrade issue in the s3vectors_fdw component when upgrading from version 0.5.6 onwards. The type name embd is being changed to s3vec, requiring proper handling of existing operators and functions during the upgrade process.

Key changes:

• Added create_or_replace attribute to the <==> operators and s3vec_distance function in Rust code
• Added a DROP OPERATOR statement in bootstrap.sql to remove the old <==> (jsonb, jsonb) operator before recreation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
wrappers/src/fdw/s3vectors_fdw/s3vec.rs	Added create_or_replace attributes to operators and function definitions to allow upgrade replacement
wrappers/sql/bootstrap.sql	Added DROP OPERATOR statement for <==> (jsonb, jsonb) to prevent conflicts during upgrade

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