chore: enable multi-threaded runtime for Tokio and require rusqlite

- Updated Tokio dependency to version 1.15 with the rt-multi-thread feature enabled.
- Removed  from rusqlite so that it is now a required dependency.

Author: csgui

testnet/stacks-node/Cargo.toml

@@ -38,7 +38,7 @@ tikv-jemallocator = {workspace = true}
 
 [dev-dependencies]
 warp = "0.3.5"
-tokio = "1.15"
+tokio = { version = "1.15", features = ["rt-multi-thread"] }
 reqwest = { version = "0.11", default-features = false, features = ["blocking", "json", "rustls", "rustls-tls"] }
 clarity = { path = "../../clarity", features = ["default", "testing"]}
 stacks-common = { path = "../../stacks-common", features = ["default", "testing"] }
@@ -56,7 +56,6 @@ serial_test = "3.2.0"
 [dependencies.rusqlite]
 workspace = true
 features = ["blob", "serde_json", "i128_blob", "bundled", "trace"]
-optional = true
 
 [[bin]]
 name = "stacks-node"