Provide programmatic alternative to @ConcurrencyLimit #35553
                
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This change introduces a programmatic alternative to @ConcurrencyLimit.
I've structured this implementation similarly to RetryTemplate.
Closes gh-35460
As a side note, it might be worth exploring a design for ConcurrencyThrottleInterceptor that's similar to AbstractRetryInterceptor in the future. 😀
This is my first time contributing, so I'm very open to feedback. Please let me know what can be improved or what kind of tests you'd like to see added.