Add time filter functionality

[davidchuang5]

Overview

• User's input in 'From' and 'Until' are compared to times on process logs
• Process logs containing times within 'From' and 'Until' time range are displayed
• Process logs containing times out of time range are not displayed
• Failure to input anything, or deletion of inputs resets state, and displays all process logs

All process logs are within time range

Process logs are no longer within time range

Deletion of input or no input at all renders all process logs

[scotthallock]

You can now resuse the checkValidity function here too:

error={!checkValidity(fromTimestamp || '0')}

I think a better name for the function would be isTimestampValid

• It is declarative and tells you what the function is checking
• Functions that return a boolean are often named this way; you can easily deduce what the function does