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* Adding metadata to matrix endpoint * Adding Tileset metadata with mandatory fields * Making metadata.json not mandatory, except when it is * Adding pydantic models Using models in place of json text * Adding metadata to matrix endpoint * Adding Tileset metadata with mandatory fields * Making metadata.json not mandatory, except when it is * Adding pydantic models Using models in place of json text * Fix tilesets template Co-authored-by: Francesco Bartoli <francesco.bartoli@geobeyond.it>