[ref] gva: move write ops specific to gva in gva folder

Cargo.lock

Cargo.toml

rust-bins/duniter-dbex/Cargo.toml

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

rust-libs/duniter-dbs-write-ops/Cargo.toml

rust-libs/duniter-dbs-write-ops/src/apply_block.rs

rust-libs/duniter-dbs-write-ops/src/bc.rs

rust-libs/duniter-dbs-write-ops/src/lib.rs

rust-libs/duniter-module/Cargo.toml

rust-libs/duniter-module/src/lib.rs

rust-libs/duniter-server/Cargo.toml

rust-libs/duniter-server/src/lib.rs

rust-libs/modules/gva/Cargo.toml

rust-libs/modules/gva/db-writer/Cargo.toml

rust-libs/modules/gva/db-writer/src/identities.rs

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

rust-libs/modules/gva/db-writer/src/tx.rs

rust-libs/modules/gva/db-writer/src/utxos.rs

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

rust-libs/tests/duniter-integration-tests/Cargo.toml