refactor: replace wiremock with own test harness

Reasons:
- there are too many layers of types that transfer/modify things
- we gonna need a test harness that supports TLS/HTTPs
- we need kinda precise control over which protocols are used to know
  what we're actually testing here
- I wanna use something simple, i.e. not a full-blown "we launch a
  server in the background" magic thing like `httpmock`

Author: crepererum

Cargo.lock

@@ -17,6 +17,7 @@ license = "MIT OR Apache-2.0"
 
 [workspace.dependencies]
 arrow = { version = "57.1.0", default-features = false, features = ["ipc"] }
+bytes = "1.11.1"
 chrono = { version = "0.4.44", default-features = false }
 datafusion = { version = "52.0.0", default-features = false }
 datafusion-common = { version = "52.0.0", default-features = false }
@@ -36,6 +37,7 @@ gungraun = "0.18.1"
 http = { version = "1.4.0", default-features = false }
 http-body-util = "0.1.3"
 hyper = { version = "1.9", default-features = false }
+hyper-util = "0.1.20"
 insta = { version = "1.47.2", "default-features" = false }
 log = { version = "0.4.29", default-features = false }
 pyo3 = { version = "0.28.3", default-features = false, features = ["macros"] }

Cargo.toml

@@ -36,18 +36,20 @@ wasmtime-wasi-http.workspace = true
 wasmtime-wasi-io.workspace = true
 
 [dev-dependencies]
+bytes.workspace = true
 datafusion-udf-wasm-bundle = { workspace = true, features = [
   "evil",
   "example",
   "python"
 ] }
 flate2.workspace = true
 gungraun.workspace = true
+http-body-util = { workspace = true, features = ["full"] }
+hyper-util = { workspace = true, features = ["server", "tokio"] }
 insta.workspace = true
 regex.workspace = true
 target-lexicon.workspace = true
 tokio = { workspace = true, features = ["fs", "macros"] }
-wiremock = "0.6.5"
 
 [features]
 default = ["compiler"]

host/Cargo.toml

@@ -21,17 +21,19 @@ pub use crate::component::CompilationFlags;
 
 // unused-crate-dependencies false positives
 #[cfg(test)]
+use bytes as _;
+#[cfg(test)]
 use datafusion_udf_wasm_bundle as _;
 #[cfg(test)]
 use flate2 as _;
 #[cfg(test)]
 use gungraun as _;
 #[cfg(test)]
+use hyper_util as _;
+#[cfg(test)]
 use regex as _;
 #[cfg(test)]
 use target_lexicon as _;
-#[cfg(test)]
-use wiremock as _;
 
 mod bindings;
 mod component;