Feat/select all textarea

[danolekh]

• added ability to do select all (cmd+a / ctrl+a behaviour) for textareas Feature request: select-all (Cmd+A) for Textarea #518
• browser-like arrow left/right behaviour with selections
• added test for bug: selection changes on textarea viewport change #549

[pkg-pr-new]

@opentui/core

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@opentui/react

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@opentui/solid

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@opentui/core-darwin-arm64

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@opentui/core-darwin-x64

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@opentui/core-linux-arm64

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@opentui/core-linux-x64

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@opentui/core-win32-arm64

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@opentui/core-win32-x64

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commit: d64ac66