CHANGE: Remove redundant FastMouse current time call on InputState.Change (case ISX-1414)

[AlexTyrer]

Description

Reduce FastMouse calls to get the current time (one of them is redundant).

Changes made

FastMouse.OnNextUpdate() makes two calls to InputState.Change() - one each for delta and scroll.

This results in two calls to InputRuntime.s_Instance.currentTime inside the InputSystem.Change() to pass as a parameter to the InputSystem UpdateState().

Instead query the current time and pass that as a parameter to the new templated Change<>() function which takes a time parameter. Events have their own internalTime which is used if present.

Checklist

Before review:

• [x] Changelog entry added.
  • Explains the change in Changed, Fixed, Added sections.
  • For API change contains an example snippet and/or migration example.
  • FogBugz ticket attached, example ([case %number%](https://issuetracker.unity3d.com/issues/...)).
  • FogBugz is marked as "Resolved" with next release version correctly set.
• [x] Tests added/changed, if applicable.
  • Functional tests Area_CanDoX, Area_CanDoX_EvenIfYIsTheCase, Area_WhenIDoX_AndYHappens_ThisIsTheResult.
  • Performance tests.
  • Integration tests.
• [x] Docs for new/changed API's.
  • Xmldoc cross references are set correctly.
  • Added explanation how the API works.
  • Usage code examples added.
  • The manual is updated, if needed.

During merge: CHANGE: FastMouse.OnNextUpdate() now passes the current time as a parameter to InputState.Change() improving performance (case ISX-1414)

• [ ] Commit message for squash-merge is prefixed with one of the list:
  • NEW: ___.
  • FIX: ___.
  • DOCS: ___.
  • CHANGE: ___.
  • RELEASE: 1.1.0-preview.3.

[AlexTyrer]

Looks like I may need to fix-up some documentation after adding the default parameter.

This change also fails the APIVerificationTests.cs test:

o APIVerificationTests.API_MinorVersionsHaveNoBreakingChanges

[jfreire-unity]

Looks like I may need to fix-up some documentation after adding the default parameter.

This change also fails the APIVerificationTests.cs test:

o APIVerificationTests.API_MinorVersionsHaveNoBreakingChanges

Yeah.. maybe we need a overload method to not break the API, unfortunately.

[AlexTyrer]

Looks like I may need to fix-up some documentation after adding the default parameter. This change also fails the APIVerificationTests.cs test: o APIVerificationTests.API_MinorVersionsHaveNoBreakingChanges

Yeah.. maybe we need a overload method to not break the API, unfortunately.

I've added a new Change<>() API that takes a non-optional time parameter - this leaves the existing API unchanged.

[AlexTyrer]

/ci prv

[AlexTyrer]

Closing as do not intend to land in trunk due to API change)