refactor: improve network subgraph querying

Leverage serde and serde_json more for serializing queries and deserializing responses in particular. There are tools that go even further with typing GraphQL query and response types (see https://github.com/graphql-rust/graphql-client#getting-started) but my feeling is that would be overkill here.
graphprotocol · Sep 29, 2023 · b171261 · b171261
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commit b171261
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diff --git a/Cargo.lock b/Cargo.lock
diff --git a/common/Cargo.toml b/common/Cargo.toml
@@ -21,6 +21,7 @@ secp256k1 = { version = "0.27.0", features = ["recovery"] }
 serde = { version = "1.0.188", features = ["derive"] }
 serde_json = "1.0.107"
 tokio = { version = "1.32.0", features = ["full", "macros", "rt"] }
+toolshed = { git = "https://github.com/edgeandnode/toolshed", tag = "v0.2.2", features = ["graphql"] }
 
 [dev-dependencies]
 env_logger = "0.9.0"