Assert that JSObject is being accessed only from the owner thread

[kateinoigakukun]

This is not the ideal solution but it's much better than silently corrupting the heap space. Partially resolve #271

[github-actions]

Time Change: +94ms (0%)

Total Time: 9,553ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import with int	14ms	-1ms	✅

View Unchanged

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	18ms	-0ms
Serialization/JavaScript function call from Swift	108ms	+1ms
Serialization/Swift Int to JavaScript with assignment	321ms	-3ms (0%)
Serialization/Swift Int to JavaScript with call	1,020ms	+24ms (2%)
Serialization/JavaScript Number to Swift Int	291ms	+1ms
Serialization/Swift String to JavaScript with assignment	385ms	+3ms (0%)
Serialization/Swift String to JavaScript with call	1,065ms	+4ms (0%)
Serialization/JavaScript String to Swift String	3,650ms	+52ms (1%)
Object heap/Increment and decrement RC	2,670ms	+16ms (0%)

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