fix: 🩹 Amend wasmtime precompiled PR review (#13)

* fix:  Remove use of `log` in favour of `tracing` in `sc-executor`

* fix:  Fix `node-cli` build for missing parameter added to `cmd.run()`

* fix: :adhesive_bandage: Fix doc for `wasmtime-precompiled` argument

* fix: :adhesive_bandage: Avoid looping through precompiles directory and search directly for filename

* docs:  Comment fixes and clarifying which WASM code is precompiled

* fix: :adhesive_bandage: Use configured hasher instead of blake2 always

* fix: :adhesive_bandage: Error out if chainspec does not contain `:code` storage element

* feat:  Add parser to CLI path arguments to check that they are existing directories

* fix: :adhesive_bandage: Change `with_wasmtime_precompiled_path` to `with_optional_wasmtime_precompiled_path` to handle optional inside

* fix:  Improve doc comments

* fix: :adhesive_bandage: Write directly to file instead of creating it and then writing

* style:  Apply `cargo fmt`