Add recipe to migrate Filter to OncePerRequestFilter

[jkschneider]

What's Changed

Adds a new recipe MigrateFilterToOncePerRequestFilter that migrates classes implementing javax.servlet.Filter (or jakarta.servlet.Filter) to extend Spring's OncePerRequestFilter.

The recipe performs the following transformations:

• Changes implements Filter to extends OncePerRequestFilter
• Renames doFilter method to doFilterInternal
• Changes visibility from public to protected
• Changes parameter types from ServletRequest/ServletResponse to HttpServletRequest/HttpServletResponse
• Adds @Override annotation to doFilterInternal
• Removes empty init() and destroy() methods (preserves non-empty ones)
• Handles classes implementing multiple interfaces (e.g., Filter, Serializable)

Context

• Addresses moderneinc/customer-requests#1740

This recipe helps with migrating from raw servlet Filters (commonly used in Acegi 1) to Spring's OncePerRequestFilter which became the standard in Spring Security 3+.

Testing

Added comprehensive test cases covering:

• Basic filter migration
• Filter with empty init/destroy methods (removed)
• Filter with non-empty init method (preserved)
• No-op for classes already extending OncePerRequestFilter
• No-op for classes not implementing Filter
• Filter implementing multiple interfaces

Checklist

• Tests pass locally
• New tests added for the change
• No breaking changes (or breaking changes documented)