Add withModifiedContext to StructuredLogger

[ivan-klass]

Add ability to modify context, similar to Logger.withModifiedString
Example: mask some sensitive structure field values

val currentLogger: StructuredLogger[F] = ???
val maskRe = "(?<=.{3}).(?=[^@]*?@)".r
val hideEmailLogger = StructuredLogger.withModifiedContext(currentLogger) {
  ctx => ctx.get("clientEmail").fold(ctx)(
    email => ctx.updated("clientEmail", maskRe.replaceAllIn(email, "*"))
  )
}

[rossabaker]

I'm just trying to do releases. Paging the experts who use this library more extensively before I merge.

[lorandszakacs]

I like this addition to the library 👍

I would like to see the same method added to org.typelevel.log4cats.SelfAwareStructuredLogger as well to maintain predictability in usage.

[lorandszakacs]

This can be easily turned back into a val, right? Since applying a pure function to the same value, yields the same result.

[ivan-klass]

@lorandszakacs thanks! I've replaced with lazy val

[ivan-klass]

I would like to see the same method added to org.typelevel.log4cats.SelfAwareStructuredLogger as well to maintain predictability in usage.

Added similar method to SelfAwareStructuredLogger

[lorandszakacs]

LGTM 👍

@ChristopherDavenport, do you want to review this?

[rossabaker]

👍 We'll need to not forget to merge this forward to main before releasing that.