refactor(async)!: add AsyncEsploraClient trait

Author: oleonardolima

Cargo.toml

@@ -23,6 +23,8 @@ log = { version = "^0.4" }
 minreq = { version = "2.11.0", features = ["json-using-serde"], optional = true }
 reqwest = { version = "0.11", features = ["json"], default-features = false, optional = true }
 serde = { version = "1.0", features = ["derive"] }
+async-trait = { version = "0.1.81"}
+
 
 [dev-dependencies]
 electrsd = { version = "0.28.0", features = ["legacy", "esplora_a33e97e1", "bitcoind_25_0"] }