Add Duration overloads. Fixes #1815

[kluever]

Add new java.time.Duration-based public APIs to Mockito, After, and Timeout and deprecate the corresponding long-based public APIs.
Plumb those Duration instances through the internals of Mockito.

[codecov-io]

Codecov Report

Merging #1818 into release/3.x will decrease coverage by 0.04%.
The diff coverage is 84.37%.

@@                Coverage Diff                @@
##             release/3.x    #1818      +/-   ##
=================================================
- Coverage          86.76%   86.71%   -0.05%     
- Complexity          2490     2492       +2     
=================================================
  Files                311      311              
  Lines               6542     6549       +7     
  Branches             821      821              
=================================================
+ Hits                5676     5679       +3     
- Misses               670      674       +4     
  Partials             196      196

Impacted Files	Coverage Δ	Complexity Δ
...java/org/mockito/internal/exceptions/Reporter.java	93.51% <ø> (ø)	93 <0> (ø)	⬇️
src/main/java/org/mockito/Mockito.java	96.87% <100%> (+0.1%)	44 <4> (+2)	⬆️
...nternal/verification/VerificationOverTimeImpl.java	92.1% <100%> (ø)	16 <5> (ø)	⬇️
...erification/VerificationWrapperInOrderWrapper.java	100% <100%> (ø)	6 <0> (ø)	⬇️
src/main/java/org/mockito/verification/After.java	77.77% <50%> (-22.23%)	4 <2> (ø)
...rc/main/java/org/mockito/verification/Timeout.java	69.23% <60%> (-12.59%)	5 <3> (ø)
src/main/java/org/mockito/internal/util/Timer.java	86.66% <90.9%> (+0.95%)	8 <7> (ø)	⬇️

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[TimvdLippe]

Could we have some additional integration tests that use the new timeout method? E.g. add some new tests like

mockito/src/test/java/org/mockitousage/verification/VerificationWithTimeoutTest.java

Lines 49 to 58 in 68bc593

	@Test
	public void should_verify_with_timeout() {
	// when
	async.runAfter(50, callMock('c'));
	async.runAfter(500, callMock('c'));
	// then
	verify(mock, timeout(200).only()).oneArg('c');
	verify(mock).oneArg('c'); //sanity check
	}