Export UnsafeEventLoopYield error type

[kateinoigakukun]

Some apps wrap instance.exports and monitor
exceptions thrown during execution of Wasm program but UnsafeEventLoopYield is not something they
want to report, so they need to be able to filter them out. However, they cannot use UnsafeEventLoopYield type name because some bundlers can rename it.
We should export it to allow them not to depend on the constructor name

[github-actions]

Time Change: -290ms (3%)

Total Time: 9,618ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	26ms	-2ms (8%)	✅
Serialization/JavaScript function call through Wasm import with int	22ms	-2ms (11%)	👏
Serialization/JavaScript function call from Swift	120ms	-15ms (12%)	👏
Serialization/Swift Int to JavaScript with assignment	337ms	-19ms (5%)	✅
Serialization/Swift Int to JavaScript with call	963ms	-52ms (5%)	✅
Serialization/JavaScript Number to Swift Int	263ms	-23ms (8%)	✅

View Unchanged

Test name	Duration	Change
Serialization/Swift String to JavaScript with assignment	416ms	-15ms (3%)
Serialization/Swift String to JavaScript with call	1,056ms	-36ms (3%)
Serialization/JavaScript String to Swift String	3,589ms	-107ms (2%)
Object heap/Increment and decrement RC	2,788ms	-27ms (0%)

View Baselines

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