[GR-70727] Add dynamic access metadata JSON file schema

[graalvmbot]

In this PR we introduce the schema for the dynamic-access-metadata.json JSON file. This file can be put on the classpath and is consumed by the Dynamic Access tab of the Build Report to expand the information on the correlation between metadata providing classpath JAR entries and the JAR entries they provide metadata for.

The schema follows the following format:

[
  {
    "metadataProvider": "<metadata_provider_jar_path>",
    "providesFor": [
      "<covered_entry_1_jar_path>",
      "<covered_entry_2_jar_path>",
      ...
    ]
  },
  ...
]