[source-recurly] add option to select domain for account

[federiconeri]

Topic

Source configuration is not working with EU account

Relevant information

After using my Recurly API I got the error:

Configuration check failed
'Unauthorized. Please ensure you are authenticated correctly.'

Make sure that the connection is working for Recurly's accounts that are based in EU. The main difference is that the account name is not [your-account].recurly.com, but [your-account].eu.recurly.com. I open this issue because I had the same problem with other connection using Recurly's API (for e.g: with Baremetrics and they had to update their connections in order to manage Recurly's EU based account)

[marcosmarxm]

@airbytehq/community-contractors can be an interesting case :)