WPF - Allow ToolTip timer configuration

[amaitland]

Related to issue #4048

Summary:
Allow programmatic configuration of ToolTip timer delay.

Changes:

• Can set initial show delay in xaml via existing ToolTipService e.g. ToolTipService.InitialShowDelay="100"
• If InitialShowDelay = 0 then no timer is used and ToolTip is immediately shown
• Previous delay was 500ms, new delay is the .Net default (typically 1000ms)
• ToolTipService.GetInitialShowDelay is currently only called in OnLoaded, setting the delay dynamically is not currently supported. Simplest option is to set the delay in xaml

How Has This Been Tested?

• Manually via CefSharp.Wpf.Example

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Updated documentation

Checklist:

• Tested the code(if applicable)
• Commented my code
• Changed the documentation(if applicable)
• New files have a license disclaimer
• The formatting is consistent with the project (project supports .editorconfig)

[amaitland]

If InitialShowDelay = 0 then no timer is used and ToolTip is immediately shown

Related discussion at #4048 (comment)

There's still a few other cases that should be tested.

[AppVeyorBot]

❌ Build CefSharp 110.0.220-CI4686 failed (commit 9cf549765a by @amaitland)