The parameter format is: key=value,type,identifying
Previously, the parser split on ALL commas, which broke when values
contained commas. For example, "items=apple,banana,orange" would be
incorrectly parsed, treating "banana" as a type name.

This commit adds intelligent parsing that:
1. Checks if the second-to-last token looks like a class name
2. If yes, treats everything before it as the value (which may contain commas)
3. If no, treats the entire string as the value with commas included

The heuristic "looks like a class name" checks for:
- Fully qualified class names (contain dots like java.lang.String)
- Primitive types (int, long, double, etc.)

This allows values containing commas to work correctly while
maintaining backward compatibility with existing parameter formats.

Fixes spring-projects#5329

Signed-off-by: Nikita Nagar <permanayan84@gmail.com>