PackageToJS: Add WebAssembly namespace option to instantiate

[kateinoigakukun]

This allows us to insert several hooks like https://github.com/kateinoigakukun/wasm-memprof

[github-actions]

Time Change: +354ms (3%)

Total Time: 9,921ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	24ms	+3ms (10%)	⚠️
Serialization/JavaScript function call through Wasm import with int	21ms	+2ms (10%)	⚠️
Serialization/JavaScript function call from Swift	135ms	+10ms (7%)	🔍
Serialization/Swift Int to JavaScript with assignment	360ms	+29ms (7%)	🔍
Serialization/Swift Int to JavaScript with call	1,011ms	+55ms (5%)	🔍
Serialization/JavaScript Number to Swift Int	280ms	+19ms (6%)	🔍
Serialization/Swift String to JavaScript with assignment	441ms	+32ms (7%)	🔍

View Unchanged

Test name	Duration	Change
Serialization/Swift String to JavaScript with call	1,094ms	+53ms (4%)
Serialization/JavaScript String to Swift String	3,709ms	+139ms (3%)
Object heap/Increment and decrement RC	2,808ms	+8ms (0%)

View Baselines

Test name	Duration
Serialization/Call JavaScript function directly	10ms
Serialization/Assign JavaScript number directly	6ms
Serialization/Call with JavaScript number directly	7ms
Serialization/Write JavaScript string directly	8ms
Serialization/Call with JavaScript string directly	6ms