Add `sharedMemory` option to allow threads with shared memory

[github-actions[bot]]

Time Change: +230ms (2%)

Total Time: 9,278ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	18ms	-1ms (6%)	✅

View Unchanged

| Test name | Duration | Change | | :--- | :---: | :---: | | Serialization/JavaScript function call through Wasm import with int | 14ms | -0ms | | Serialization/JavaScript function call from Swift | 92ms | -3ms (3%) | | Serialization/Swift Int to JavaScript with assignment | 320ms | -4ms (1%) | | Serialization/Swift Int to JavaScript with call | 926ms | +13ms (1%) | | Serialization/JavaScript Number to Swift Int | 299ms | -1ms (0%) | | Serialization/Swift String to JavaScript with assignment | 375ms | +1ms | | Serialization/Swift String to JavaScript with call | 980ms | +17ms (1%) | | Serialization/JavaScript String to Swift String | 3,614ms | +142ms (3%) | | Object heap/Increment and decrement RC | 2,628ms | +67ms (2%) |

View Baselines

| Test name | Duration | | :--- | :---: | | Serialization/Call JavaScript function directly | 3ms | | Serialization/Assign JavaScript number directly | 2ms | | Serialization/Call with JavaScript number directly | 3ms | | Serialization/Write JavaScript string directly | 2ms | | Serialization/Call with JavaScript string directly | 2ms |