Added installer

[IvanMurzak]

This pull request removes all workflow YAML files for Unity CI builds and tests across multiple Unity versions. These files previously defined GitHub Actions workflows for building, running edit mode and play mode tests for various Unity releases. With these deletions, automated CI for Unity projects via GitHub Actions is disabled for all listed versions.

Removal of Unity CI workflows

• Deleted build workflows for Unity versions: 2019.4.40f1, 2020.3.40f1, 2021.3.45f1, 2022.3.57f1, 2023.1.20f1, 2023.2.20f1, and 6000.0.37f1 (.github/workflows/*_build.yml). [1] [2] [3] [4] [5] [6] [7]
• Deleted editor test workflows for the same Unity versions (.github/workflows/*_editor.yml). [1] [2] [3] [4] [5] [6] [7]
• Deleted player (play mode) test workflows for the same Unity versions (.github/workflows/*_player.yml). [1] [2] [3] [4] [5] [6]

This change disables all automated build and test jobs for Unity projects that were previously triggered by pushes or pull requests to the repository.

[Copilot]

Pull Request Overview

This pull request introduces a new Unity Package Installer containing the complete Asset Store Tools package including uploader, validator, and preview generation capabilities. The PR replaces Unity CI workflow files with a comprehensive Unity Editor package.

• Introduces complete Asset Store Tools package with uploader, validator, and preview generator components
• Adds UI framework with UIElements-based interfaces for package management
• Implements comprehensive API layer for Asset Store communication and package uploading

Reviewed Changes

Copilot reviewed 298 out of 1159 changed files in this pull request and generated 2 comments.

File	Description
Installer/Packages/com.unity.asset-store-tools/Editor/Previews/	Comprehensive preview generation system including UI elements, data models, generators, and utility classes
Installer/Packages/com.unity.asset-store-tools/Editor/Exporter/	Package export functionality with abstraction layer and multiple export implementations
Installer/Packages/com.unity.asset-store-tools/Editor/Api/	Asset Store API integration including authentication, uploading, and response handling
Multiple .meta files	Unity asset metadata files for proper package integration

Comments suppressed due to low confidence (1)

Installer/Packages/com.unity.asset-store-tools/Editor/Previews/Scripts/UI/Elements/PreviewGeneratorPathsElement.cs:1

• The error message refers to 'validation path' but this is in the context of preview generation paths. The message should refer to 'preview generation path' for consistency and clarity.

using AssetStoreTools.Previews.UI.Data;

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