Rework component events

[DavidVollmers]

• Reworked component events to allow preventing default behaviors
• Introduce OnBlur and OnFocus events for all FocusComponentBase components
  • Due to this the protected methods OnFocus, OnFocusAsync, OnBlur and OnBlurAsync had to be renamed to OnTargetFocus, etc.

[DavidVollmers]

This will solve #42.

[codecov[bot]]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (8bfcd93) 42.11% compared to head (178d9a0) 41.92%. Report is 1 commits behind head on master.

Files	Patch %	Lines
...ackages/Ignis.Components.Web/FocusComponentBase.cs	0.00%	12 Missing :warning:
...nd/Ignis.Components.HeadlessUI/DisclosureButton.cs	0.00%	1 Missing :warning:
...lwind/Ignis.Components.HeadlessUI/ListboxOption.cs	0.00%	0 Missing and 1 partial :warning:
...s/Tailwind/Ignis.Components.HeadlessUI/MenuItem.cs	0.00%	1 Missing :warning:
...nd/Ignis.Components.HeadlessUI/RadioGroupOption.cs	0.00%	1 Missing :warning:
...ges/Tailwind/Ignis.Components.HeadlessUI/Switch.cs	0.00%	1 Missing :warning:
...ckages/Tailwind/Ignis.Components.HeadlessUI/Tab.cs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #43 +/- ## ========================================== - Coverage 42.11% 41.92% -0.20% ========================================== Files 82 82 Lines 2282 2290 +8 Branches 439 441 +2 ========================================== - Hits 961 960 -1 - Misses 1185 1193 +8 - Partials 136 137 +1 ```

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