[feat] gva:blocks: add field issuerName

lib/modules-lib/bc-db-reader/src/indexes/identities.rs

lib/modules-lib/bc-db-reader/src/trait.rs

lib/modules/gva/resources/schema.gql

lib/modules/gva/src/schema/entities/block.rs

lib/modules/gva/src/schema/entities/blocks_page.rs

lib/modules/gva/src/schema/queries/block.rs

lib/modules/gva/src/schema/queries/blocks.rs

lib/modules/gva/src/schema/queries/current.rs