Add maximumAllowableTags for metrics with uri

[violetagg]

Even the URI itself can be unbounded in cardinality when path variables are used (e.g. /books/{bookId} with many different values of bookId). Is there any way in Reactor Netty to specify a template URI with path variables? Regardless, allowing high cardinality for tag values is not good as it will use increasingly more memory in the application and the metrics backend will also suffer. Micrometer offers a MeterFilter to limit the maximumAllowableTags, as can be seen used here in Spring Boot: https://github.com/spring-projects/spring-boot/blob/543fcdbbfdc807dd4cc70934b076756d80e2d21c/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/web/client/HttpClientMetricsAutoConfiguration.java#L53-L61