bench-api: configure execution with a flags string (#4096)

As discussed previously, we need a way to be able to configure Wasmtime when running it in the Sightglass benchmark infrastructure. The easiest way to do this seemed to be to pass a string from Sightglass to the `bench-api` library and parse this in the same way that Wasmtime parses its CLI flags. The structure that contains these flags is `CommonOptions`, so it has been moved to its own crate to be depended on by both `wasmtime-cli` and `wasmtime-bench-api`. Also, this change adds an externally-visible function for parsing a string into `CommonOptions`, which is used for configuring an engine.

src/commands/compile.rs

@@ -1,12 +1,12 @@
 //! The module that implements the `wasmtime compile` command.
 
-use crate::CommonOptions;
 use anyhow::{bail, Context, Result};
 use clap::Parser;
 use std::fs;
 use std::path::PathBuf;
 use target_lexicon::Triple;
 use wasmtime::Engine;
+use wasmtime_cli_flags::CommonOptions;
 
 lazy_static::lazy_static! {
     static ref AFTER_HELP: String = {

src/commands/run.rs

@@ -1,6 +1,5 @@
 //! The module that implements the `wasmtime run` command.
 
-use crate::{CommonOptions, WasiModules};
 use anyhow::{anyhow, bail, Context as _, Result};
 use clap::Parser;
 use std::fs::File;
@@ -13,6 +12,7 @@ use std::{
     process,
 };
 use wasmtime::{Engine, Func, Linker, Module, Store, Trap, Val, ValType};
+use wasmtime_cli_flags::{CommonOptions, WasiModules};
 use wasmtime_wasi::sync::{ambient_authority, Dir, TcpListener, WasiCtxBuilder};
 
 #[cfg(feature = "wasi-nn")]

src/commands/wast.rs

@@ -1,10 +1,10 @@
 //! The module that implements the `wasmtime wast` command.
 
-use crate::CommonOptions;
 use anyhow::{Context as _, Result};
 use clap::Parser;
 use std::path::PathBuf;
 use wasmtime::{Engine, Store};
+use wasmtime_cli_flags::CommonOptions;
 use wasmtime_wast::WastContext;
 
 lazy_static::lazy_static! {