add changeset

.changeset/flat-avocados-appear.md

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+---
+"@janus-idp/cli": major
+---
+changes to package-dynamic-plugins command:
+
+- rename com.redhat.rhdh.plugins to io.backstage.dynamic-packages to make it more "upstream friendly"
+- add io.backstage.marketplace/<plugin-name> annotations, value is read from file specified by optional --marketplace flag
+- use base64 for annotation values