Babashka support

[athos]

To support Babashka:

• Use locking instead of ReentrantLock (as Babashka doesn't support it)
• Determine if an object is a session by checking if it implements ILogStorage, rather than the ISession marker protocol (as Babashka at this moment doesn't support marker protocols on deftypes)

[codecov]

Codecov Report

Base: 92.38% // Head: 92.38% // No change to project coverage 👍

Coverage data is based on head (71d78de) compared to base (ff159d3).
Patch coverage: 96.15% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #17   +/-   ##
=======================================
  Coverage   92.38%   92.38%           
=======================================
  Files           7        7           
  Lines         394      394           
  Branches       17       17           
=======================================
  Hits          364      364           
  Misses         13       13           
  Partials       17       17           

Impacted Files	Coverage Δ
src/postmortem/utils.cljc	71.42% <66.66%> (ø)
src/postmortem/core.cljc	86.66% <100.00%> (ø)
src/postmortem/instrument/clj.cljc	96.00% <100.00%> (ø)
src/postmortem/session.cljc	95.83% <100.00%> (ø)

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