Add .swift-format configuration and add a script to format

[kateinoigakukun]

No description provided.

[github-actions]

Time Change: -240ms (2%)

Total Time: 9,521ms

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import with int	23ms	+2ms (6%)	🔍
Serialization/JavaScript function call from Swift	126ms	-7ms (5%)	✅
Serialization/JavaScript Number to Swift Int	259ms	-16ms (6%)	✅
Serialization/Swift String to JavaScript with assignment	409ms	-24ms (5%)	✅
Serialization/Swift String to JavaScript with call	1,024ms	-60ms (5%)	✅

View Unchanged

Test name	Duration	Change
Serialization/JavaScript function call through Wasm import	25ms	+1ms
Serialization/Swift Int to JavaScript with assignment	331ms	-16ms (4%)
Serialization/Swift Int to JavaScript with call	947ms	-45ms (4%)
Serialization/JavaScript String to Swift String	3,545ms	-118ms (3%)
Object heap/Increment and decrement RC	2,798ms	+43ms (1%)

View Baselines

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