Add clock interface, real and fake clocks #33
Merged
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Discussion around the implementation of this can be found here: #31
One thing to note: I did not update the tests to use the fake clock, this is just making it capable of using the fake clock. @aaronwinter mentioned in the previous PR that he would help write those tests.
The current tests around the expiration are already flaky due to using the system clock, this change did not change the level of flakiness.