Create SchemaTransform external transform registrar
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core
java
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Description
Create a SchemaTransform external transform registrar so that SchemaTransforms can be used cross language.
A similar one exists for SchemaIO:
[sdks/java/extensions/schemaio-expansion-service/src/main/java/org/apache/beam/sdk/extensions/schemaio/expansion/ExternalSchemaIOTransformRegistrar.java](https://github.com/apache/beam/blob/7727dc99ed5dc1fb46166ef496ab3607ee2779f8/sdks/java/extensions/schemaio-expansion-service/src/main/java/org/apache/beam/sdk/extensions/schemaio/expansion/ExternalSchemaIOTransformRegistrar.java)
Imported from Jira [BEAM-14032](https://issues.apache.org/jira/browse/BEAM-14032). Original Jira may contain additional context.
Reported by: laraschmidt.
Subtask of issue #21406
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