Implement wasm_config_new and wasm_engine_new_with_config (#901)

* Implement wasm_config_new and wasm_engine_new_with_config

crates/c-api/include/wasmtime.h

@@ -0,0 +1,45 @@
+// WebAssembly C API extension for Wasmtime
+
+#ifndef WASMTIME_API_H
+#define WASMTIME_API_H
+
+#include <wasm.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef uint8_t wasmtime_strategy_t;
+enum wasmtime_strategy_enum { // Strategy
+  WASMTIME_STRATEGY_AUTO,
+  WASMTIME_STRATEGY_CRANELIFT,
+  WASMTIME_STRATEGY_LIGHTBEAM,
+};
+
+typedef uint8_t wasmtime_opt_level_t;
+enum wasmtime_opt_level_enum { // OptLevel
+  WASMTIME_OPT_LEVEL_NONE,
+  WASMTIME_OPT_LEVEL_SPEED,
+  WASMTIME_OPT_LEVEL_SPEED_AND_SIZE,
+};
+
+#define WASMTIME_CONFIG_PROP(name, ty) \
+    WASM_API_EXTERN void wasmtime_config_##name##_set(wasm_config_t*, ty);
+
+WASMTIME_CONFIG_PROP(debug_info, bool)
+WASMTIME_CONFIG_PROP(wasm_threads, bool)
+WASMTIME_CONFIG_PROP(wasm_reference_types, bool)
+WASMTIME_CONFIG_PROP(wasm_simd, bool)
+WASMTIME_CONFIG_PROP(wasm_bulk_memory, bool)
+WASMTIME_CONFIG_PROP(wasm_multi_value, bool)
+WASMTIME_CONFIG_PROP(strategy, wasmtime_strategy_t)
+WASMTIME_CONFIG_PROP(cranelift_debug_verifier, bool)
+WASMTIME_CONFIG_PROP(cranelift_opt_level, wasmtime_opt_level_t)
+
+///////////////////////////////////////////////////////////////////////////////
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif // WASMTIME_API_H