improve dictionary support

[temonk]

Title

Update version and improve dictionary support

Details

• Bumped version to 1.0.13 in Directory.Build.props
• Enhanced dictionary index access in SimpraParserVisitor
• Added Countries and DictionaryOfObjects properties to TestModel

[Copilot]

Pull Request Overview

This PR updates the version and enhances dictionary support in the Simpra project.

• Version bumped to 1.0.13 in Directory.Build.props
• Enhanced index access in SimpraParserVisitor to better handle IDictionary types
• Added tests for dictionary index access and new properties in TestModel

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/AltaSoft.Simpra.tests/SimpraExpressionTests.cs	Added tests to verify dictionary index access behavior for both Customers and Countries properties.
tests/AltaSoft.Simpra.tests/Models/TestModel.cs	Added new properties for dictionary support.
src/AltaSoft.Simpra/Visitor/SimpraParserVisitor.cs	Improved dictionary index access with dedicated handling logic using new language syntax.
Directory.Build.props	Updated version to 1.0.13.

Comments suppressed due to low confidence (1)

tests/AltaSoft.Simpra.tests/SimpraExpressionTests.cs:9

• [nitpick] Consider renaming the test method 'CallGetValueFromDictionaryWhenKeyDoesNotExist_ShouldReturnDefault2' to more clearly indicate it pertains to the 'DictionaryOfObjects' property, differentiating it from the Countries test for improved clarity.

public void CallGetValueFromDictionaryWhenKeyDoesNotExist_ShouldReturnDefault2()