Add ECS0005: prefer formattablestring for culture specific strings

[rjmurillo]

This pull request introduces a new Roslyn analyzer and associated code fix provider to enforce best practices for culture-specific string formatting in C#. The analyzer identifies cases where FormattableString or string.Create should be used instead of string for interpolated strings, depending on the target framework version. The code fix provider automatically suggests the appropriate replacement.

Changes

• Analyzer: FormattableStringForCultureSpecificStringsAnalyzer
  • Detects culture-specific string usage and recommends either FormattableString, string.Create, or string.Format based on the .NET version.
• Code Fix Provider: FormattableStringForCultureSpecificStringsCodeFixProvider
  • Provides automated fixes based on the analyzer's recommendations.
• Tests: Comprehensive unit tests covering various scenarios, including different .NET versions and complex string interpolation cases.

This analyzer aligns modern C# and .NET practices, particularly Stephen Toub's guidance on using string.Create in .NET 6+

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:x: -1.47% (target: -1.00%)	:white_check_mark: 86.57%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (c5a55a18c852dca4b3263883e27a6c14be218100) | 595 | 548 | 92.10% | | | Head commit (c99180a5762cb5cdf644c024b304b8864044f8f9) | 811 (+216) | 735 (+187) | 90.63% (**-1.47%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#49) | 216 | 187 | **86.57%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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