Navigable inspected exceptions

Currently, if we're inspecting an Exception, we cannot directly navigate to the file/line of each element of the rendered stacktrace.

i.e., this stacktrace is just text atm:


Currently, a workaround is to `d` (`cider-inspector-def-current-val`) the inspected Exception, and then `throw` it in the repl. `cider-stacktrace-analyze-in-region` may also work.

I think that something very "inspector-like" would be to reify the stacktrace into something that also is navigable:

* navigable cause chain
* individual stacktraceelements rendered similarly to members of a vector
* a keybinding / click action to open stacktraceelements as clojure buffer