[ref] rename crate duniter-gva-db-writer -> duniter-gva-indexer

Cargo.lock

Cargo.toml

rust-bins/duniter-dbex/Cargo.toml

rust-bins/duniter-dbex/src/migrate.rs

rust-libs/modules/gva/Cargo.toml

rust-libs/modules/gva/indexer/Cargo.toml

rust-libs/modules/gva/indexer/src/identities.rs

rust-libs/modules/gva/indexer/src/lib.rs

rust-libs/modules/gva/indexer/src/tx.rs

rust-libs/modules/gva/indexer/src/utxos.rs

rust-libs/modules/gva/src/lib.rs