Introduce BridgeJS, a declarative JS interop system

[kateinoigakukun]

#290
This is very early stage of the development but enough to ship as MVP.

See examples and documentations for more details:

• Examples/ImportTS
• Examples/ExportSwift
• Article: Exporting Swift to JavaScript
• Article: Importing TypeScript into Swift
• Article: Ahead-of-Time Code Generation with BridgeJS
• Build pipeline overview

[github-actions]

Time Change: -209ms (2%)

Total Time: 9,642ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	23ms	-5ms (19%)	👏
Serialization/Swift String to JavaScript with call	1,049ms	-62ms (5%)	✅

View Unchanged

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import with int	22ms	-1ms
Serialization/JavaScript function call from Swift	129ms	+5ms (4%)
Serialization/Swift Int to JavaScript with assignment	326ms	-14ms (4%)
Serialization/Swift Int to JavaScript with call	974ms	-29ms (3%)
Serialization/JavaScript Number to Swift Int	265ms	-9ms (3%)
Serialization/Swift String to JavaScript with assignment	407ms	-16ms (3%)
Serialization/JavaScript String to Swift String	3,634ms	-82ms (2%)
Object heap/Increment and decrement RC	2,777ms	+5ms (0%)

View Baselines

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