Pass the original exception to result-fn

[marcomorain]

To make auditing and monitoring easier, we now pass the reported Throwable to the result-fn.

Changes:

• Make all functions that should be private private.
• Add type-hints where appropriate.
• Document the client function and the options that it takes.
• Unchaught exceptions now report the Thread's name as 'thread-name' instead of 'thread'
• Uncaught exceptions are reported at level 'critical' (used to be 'error')

[codecov[bot]]

Codecov Report

Merging #18 into master will increase coverage by 0.7%. The diff coverage is 92.3%.

@@            Coverage Diff            @@
##           master      #18     +/-   ##
=========================================
+ Coverage   94.36%   95.07%   +0.7%     
=========================================
  Files           2        2             
  Lines         142      142             
  Branches        5        5             
=========================================
+ Hits          134      135      +1     
+ Misses          3        2      -1     
  Partials        5        5

Impacted Files	Coverage Δ
src/circleci/rollcage/core.clj	94.73% <92.3%> (+0.75%)	:arrow_up:

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