Add Blazorise.Analyzers migration analyzers for Blazorise 2.0

[stsrki]

Blazorise.Analyzers

• Add new Roslyn analyzer package Blazorise.Analyzers (netstandard2.0) to help migrate existing codebases to Blazorise
  2.0 by surfacing breaking changes directly on .razor/C# source locations.
• Implement RenderTreeMigrationEngine to walk Razor-generated RenderTreeBuilder code (including Blazor
  TypeInference.Create* call sites and RuntimeHelpers.TypeCheck wrappers) and provide a common hook for multiple
  migration rules.
• Add centralized migration data in Source/Helpers/Blazorise.Analyzers/BlazoriseMigrationMappings.cs covering
  component renames, parameter renames, TValue shape expectations (single vs multi selection), plus type/member
  renames/removals (with notes).
• Add analyzer packaging glue via Source/Helpers/Blazorise.Analyzers/build/Blazorise.Analyzers.props to auto-load the
  analyzer and include host files (index.html, _Host.cshtml, App.razor) as AdditionalFiles for non-C# analysis.
• Add Tests/Blazorise.Analyzers.Tests xUnit suite validating rule behavior across common migration scenarios
  (component/tag/parameter renames, TValue shape validation, type inference cases, host-file scanning, member/type
  changes).
• Dogfood the analyzer by referencing it as an analyzer in Demos/Blazorise.Demo/Blazorise.Demo.csproj and
  Documentation/Blazorise.Docs/Blazorise.Docs.csproj; update Demos/Blazorise.Demo/Pages/Tests/CardsPage.razor to use
  CardLink.To (was Source).
• Update repo plumbing: add Microsoft.CodeAnalysis version to Directory.Packages.props, include new projects in
  Blazorise.slnx, pack the analyzer in NuGet/dotnet-pack.bat, and ignore obj-nuget/ in .gitignore.

Diagnostics Added

• BLZC001 Blazorise component renamed
• BLZR001 Blazorise Razor tag renamed
• BLZP001 Blazorise parameter renamed
• BLZP002 Blazorise parameter type changed (e.g., DataGridColumn.Width, Row/Fields.Gutter)
• BLZT001 Blazorise TValue shape invalid (single vs list/array for multi-selection)
• BLZS001 Blazorise member renamed
• BLZS002 Blazorise member removed
• BLZTYP001 Blazorise type renamed
• BLZTYP002 Blazorise type removed
• BLZJS001 Blazorise Charts static Chart.js script reference (host-file cleanup)

Release Tracking

• Populate AnalyzerReleases.Shipped.txt / AnalyzerReleases.Unshipped.txt to track shipped vs in-progress rule IDs for
  the analyzer package.

Blazorise.Analyzers.Tests

• New test project in Tests/Blazorise.Analyzers.Tests runs the analyzer against in-memory compilations.
• Tests cover the three diagnostics: component rename, parameter rename, and TValue shape errors for single vs multi-
  selection.