feature: ReflectionSource and DictionarySource

[axunonb]

Closes #425

Changes to ReflectionSource

• Modified ReflectionSource.TypeCache to be static, shared across all instances.
• Implemented a control mechanism for the size of ReflectionSource.TypeCache. When the cache exceeds the maximum size limit, it now removes the oldest entry first, adhering to a First-In-First-Out (FIFO) strategy.
• Enhanced documentation for CaseSensitivityType.CaseInsensitive: Clarified that in scenarios where multiple members share the same name but differ in case, the first encountered member will be selected.

Updates to DictionarySource

• Correction: Ensured that generic dictionaries and dynamic objects respect the case sensitivity settings.
• Added to the documentation: Specified that the cache for IReadOnlyDictionary is deliberately scoped to the instance level.