How to parse firrtl file/string to Circuit instance?

I can convert a Circuit instance into string FIRRTL code using Serializer.serialize(circuit). So, how can I do the reverse: parse FIRRTL code (or a file) back into a Circuit instance?

I asked AI, and it suggested `val circuit = Parser.parseFile(inputFile)`. However, the Parser object actually no longer has this parseFile method. Instead, the file as follows:

``` scala
package firrtl

object Parser {

sealed abstract class InfoMode

case object IgnoreInfo extends InfoMode

case object UseInfo extends InfoMode

case class GenInfo(filename: String) extends InfoMode

case class AppendInfo(filename: String) extends InfoMode

}
```

Read the current Parser API alongside Serializer.serialize(circuit), and verify which entry point accepts FIRRTL code or a file instead of relying on the obsolete Parser.parseFile example. Done means documenting the supported conversion path using the current API.

Written by the indexing model from the issue text.