[ACE6] ACE_Time_Value Should Accept Floating-point-based std::chrono::duration

[iguessthislldo]

This is a backport of #2462

ACE_Time_Value currently doesn't accept a std::chrono::duration with Rep that's a floating point type because it's using the modulus operator to separate the microseconds (duration % seconds(1)) and trying to use modulus with floating points causes a compile error.

This changes it to use subtraction from the whole number of seconds (duration - sec) and adds a test for it.

Also:

• Simplify the -= and += ops of ACE_Time_Value
• Rewrite some of the testing in Chrono_Test.cpp.

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