Feature7043 picker textalignment (#7493) Fixes #7043.
* Implemente Text Alignment for Android
* Added HorizontalTextAlignment for ios
* Added VerticalTextAlignMent for ios
* Added HorizontalTextAlignment and VerticalTextAlignMent for UWP and WPF
* Added HorizontalTextAlignment and VerticalTextAlignment for GTK
* Refactorings:
- Moved GetAlignmentValue() to Extensions
- Replaced GetAlignmentValue() with extension method ToAlignmentValue() for PickerRenderer and LabelRenderer
* Added Picker HorizontalTextAlignment for Tizen
* Replaced implicit OnHorizontalTextAlignmentPropertyChanged method implamentation with explicit
* Added TextAlignment options in Picker Core Gallery sample
* [Tizen] Update HorizontalTextAlignment
Co-authored-by: Yuriy Holembyovskyy <yuriy.holembyovskyy@tiwgplc.com>
Co-authored-by: Yuriy Holembyovskyy <yuriy.holembyovskyy@gmail.com>
Co-authored-by: Yuriy Holembyovskyy <yuriy.holembyovskyy@authoritypartners.com>
Co-authored-by: Rui Marinho <me@ruimarinho.net>
Co-authored-by: Javier Suárez Ruiz <javiersuarezruiz@hotmail.com>
Co-authored-by: Samantha Houts <samhouts@users.noreply.github.com>
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