Add a REST API to fetch recent requests and their responses

[gberche-orange]

expected behavior

As an osb tooling author (such as osb-reverse-proxy)

• in order to use overview broker recent requests and responses programmatically
• I need a rest API

observed behavior

I could only find html output which is hard to parse

The html-xml-utils package is failing to parse overview output:

https://stackoverflow.com/questions/51913432/scraping-information-within-html-tags-in-unix-with-curl-and-cut/51913624#51913624

$ cat overview.html | hxremove title
End tag </script> doesn't match start tag <br>