Add opensearch-remote-metadata-sdk to manifest

[dbwiddis]

Description

Adds the opensearch-remote-metadata-sdk library to the manifest.

This PR is step 6 of this checklist: https://github.com/opensearch-project/opensearch-build/blob/main/ONBOARDING.md#onboard-to-build-workflow

Note that this is not a plugin. It is a library to be used by plugins in order to refactor common code to a single location. It is similar to common-utils in that respect and I attempted to follow that pattern (shadow jar rather than zip).

PR implementing the build script:

• Switch publication to shadow JAR and add build script opensearch-remote-metadata-sdk#29

Artifacts published:

> find artifacts/maven/org/opensearch -type f \( -name "*.jar" -o -name "*.pom" \) | sed 's|^artifacts/maven/org/opensearch/||' | sort

opensearch-remote-metadata-sdk-aos-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-aos-client-2.19.0-20250108.223743-1-javadoc.jar
opensearch-remote-metadata-sdk-aos-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-aos-client-2.19.0-20250108.223743-1-sources.jar
opensearch-remote-metadata-sdk-aos-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-aos-client-2.19.0-20250108.223743-1.jar
opensearch-remote-metadata-sdk-aos-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-aos-client-2.19.0-20250108.223743-1.pom
opensearch-remote-metadata-sdk-ddb-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-ddb-client-2.19.0-20250108.223743-1-javadoc.jar
opensearch-remote-metadata-sdk-ddb-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-ddb-client-2.19.0-20250108.223743-1-sources.jar
opensearch-remote-metadata-sdk-ddb-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-ddb-client-2.19.0-20250108.223743-1.jar
opensearch-remote-metadata-sdk-ddb-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-ddb-client-2.19.0-20250108.223743-1.pom
opensearch-remote-metadata-sdk-remote-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-remote-client-2.19.0-20250108.223743-1-javadoc.jar
opensearch-remote-metadata-sdk-remote-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-remote-client-2.19.0-20250108.223743-1-sources.jar
opensearch-remote-metadata-sdk-remote-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-remote-client-2.19.0-20250108.223743-1.jar
opensearch-remote-metadata-sdk-remote-client/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-remote-client-2.19.0-20250108.223743-1.pom
opensearch-remote-metadata-sdk/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-2.19.0-20250108.223743-1-javadoc.jar
opensearch-remote-metadata-sdk/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-2.19.0-20250108.223743-1-sources.jar
opensearch-remote-metadata-sdk/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-2.19.0-20250108.223743-1.jar
opensearch-remote-metadata-sdk/2.19.0-SNAPSHOT/opensearch-remote-metadata-sdk-2.19.0-20250108.223743-1.pom

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