Add debugParse

[valencik]

On a failed parse we get output like:

sbt:curly> coreJVM/run
[info] compiling 1 Scala source to /Users/valencik/projects/curly/core/.jvm/target/scala-2.13/classes ...
[info] running io.chrisdavenport.curly.Main 
curl 'https://linux.die.net/man/1/curl' -H ''User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8' -H 'Accept-Language: en-US,en;q=0.5' --compressed -H 'Referer: https://www.google.com/' -H 'Connection: keep-alive' -H 'Cookie: u=0ZfsEl8jjh6BR0aoAw9hAg==' -H 'Upgrade-Insecure-Requests: 1' -H 'Sec-Fetch-Dest: document' -H 'Sec-Fetch-Mode: navigate' -H 'Sec-Fetch-Site: cross-site' -H 'Sec-Fetch-User: ?1' -H 'Cache-Control: max-age=0'
--------------------------------------------^
Left(Error(44,NonEmptyList(ExpectedFailureAt(44,'))))

It's nice to then run ~coreJVM/run in sbt