Clean up proliferation of std::chrono duration types
#12.384 geöffnet am 30. Juli 2020
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https://github.com/envoyproxy/envoy/pull/12225 ensured that arbitrary std::chrono::{clock_type}::duration constructors cannot be used as it introduces differences in time representation/units between different platforms. @lizan suggested also ensuring that TimeSystem (used in test infrastructure) should provide a concrete duration type to reduce the proliferation of std::chrono duration types. Concrete duration aliases were added in that class but all usages of std::chrono duration types are not yet converted to TimeSystem::Nanosecond etc.
This issue is a placeholder to denote that std::chrono duration types should be replaced with TimeSystem aliases and introduce a format check to prevent their re-addition in the future.