Provide the matched PathPattern as a request attribute in MVC

On the WebMvc side, the PathPattern's pattern string is made available as a request attribute:

Line 174 in c1d4a76

    
           request.setAttribute(BEST_MATCHING_PATTERN_ATTRIBUTE, bestPattern.getPatternString());

On the WebFlux side, the PathPattern itself is available:

Line 167 in c1d4a76

exchange.getAttributes().put(BEST_MATCHING_PATTERN_ATTRIBUTE, pattern);

Could a new attribute be introduced on the MVC side that exposes the PathPattern?

If we had the PathPattern on the MVC side, I think we could rework this WebMvc-based code in Boot to match more closely to its WebFlux-based equivalent.

I'd like to work on this. I'll add focused MVC coverage for exposing the matched PathPattern as a request attribute.

Superseded by #37272

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