Tavari/animation explaration

[TanelVari]

Just forking Maria's branch. Why isn't the unmount animation playing for Popup?

[msftclas]

All CLA requirements met.

[DustyTheBot]

	Fails
🚫	Non-approved dependencies were detected. It is necessary to obtain approvals and register them in `approvedPackages` file before merge.

	Warnings
⚠️	Package (or peer) dependencies changed. Make sure you have approval before merging!

Changed dependencies are detected.

Changed dependencies in packages/react/package.json

package	before	after
@fluentui/accessibility	^0.43.0	^0.42.0
@fluentui/react-bindings	^0.43.0	^0.42.0
@fluentui/react-component-event-listener	^0.43.0	^0.42.0
@fluentui/react-component-nesting-registry	^0.43.0	^0.42.0
@fluentui/react-component-ref	^0.43.0	^0.42.0
@fluentui/react-proptypes	^0.43.0	^0.42.0
react-is	-	^16.6.3
react-transition-group	-	^4.3.0

Non-approved dependencies are detected.

The following package version constraints missing approved candidate:

failed constrains	approved candidates
@babel/runtime@^7.5.5	@babel/runtime@7.1.2, @babel/runtime@7.4.5
react-transition-group@^4.3.0	there are no any approved packages
dom-helpers@^5.0.1	there are no any approved packages

Perf comparision

Scenario	Fluent TPI	Fabric TPI	Ratio	Iterations	Ticks
Button.Fluent	1.14	0.12	9.5:1	5000	5691
Checkbox.Fluent	1.28	0.24	5.33:1	5000	6403
Icon.Fluent	0.24	0.03	8:1	5000	1197
Slider.Fluent	1.68	0.24	7:1	5000	8401

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