Add Open-Source Libraries topic for Blazor Getting Started

[Copilot]

Adds documentation for Blazor open-source packages under Getting Started section, covering IgniteUI.Blazor.Lite and IgniteUI.Blazor.GridLite NuGet packages.

Changes

• New docs: doc/en/components/general-getting-started-oss.md and Japanese translation
• TOC updates: Added "Open-Source Libraries" entry under Blazor Getting Started (EN/JP)

Content

• Installation via NuGet/CLI for both packages
• Service registration for Blazor Server and WebAssembly
• Grid Lite features overview and usage example:

<IgbGridLite Data="data" AutoGenerateColumns="true">
</IgbGridLite>

@code {
    private object[] data = new object[]
    {
        new { Name = "John", Age = 30, City = "New York" },
        new { Name = "Jane", Age = 25, City = "Los Angeles" }
    };
}

• Links to IgniteUI.Blazor.Lite and IgniteUI.Blazor.GridLite

Original prompt

Add a new topic for Blazor under Getting Started called "Open-Source Libraries"
Use the same structure as the other Getting Started app, but for the package use:
https://www.nuget.org/packages/IgniteUI.Blazor.Lite

Add also a section about Grid Lite, that uses this package:
https://www.nuget.org/packages/IgniteUI.Blazor.GridLite

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