Support TILEDB_BLOB in to_str (#3250)
Support TILEDB_BLOB in to_str (#3250)

This support printing std::byte as a uint8_t in
`tiledb::sm::utils::parse::to_str`. This is used only for
`tiledb::sm::Attribute::dump()` for `tiledb::sm::Attribute::fill_value_str`.
TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB,TileDB-Inc/TileDB