[test] server: test save_peer & receive_new_heads

Cargo.lock

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

rust-libs/duniter-server/Cargo.toml

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

rust-libs/duniter-server/src/legacy/block_indexer.rs

rust-libs/duniter-server/src/legacy/dunp.rs

rust-libs/duniter-server/src/legacy/tx_history.rs

rust-libs/duniter-server/src/legacy/txs_mempool.rs

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

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

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