Remove dependency on sandboxing host functions (#9592)

* Embed wasmi into the runtime

* cargo run --quiet --release --features=runtime-benchmarks --manifest-path=bin/node/cli/Cargo.toml -- benchmark --chain=dev --steps=50 --repeat=20 --pallet=pallet_contracts --extrinsic=* --execution=wasm --wasm-execution=compiled --heap-pages=4096 --output=./frame/contracts/src/weights.rs --template=./.maintain/frame-weight-template.hbs

Co-authored-by: Parity Benchmarking Bot <admin@parity.io>

substrate/Cargo.lock

@@ -9352,6 +9352,7 @@ name = "sp-sandbox"
 version = "0.10.0-dev"
 dependencies = [
  "assert_matches",
+ "log 0.4.14",
  "parity-scale-codec",
  "sp-core",
  "sp-io",
@@ -11141,6 +11142,7 @@ dependencies = [
  "downcast-rs",
  "errno",
  "libc",
+ "libm",
  "memory_units",
  "num-rational 0.2.4",
  "num-traits",