Fixes https://github.com/spring-cloud/stream-applications/issues/275 Many functions make use of `ComponentCustomizer` ot let end-user to provide any custom configuration for target component used by the function. First of all for use-case which are not covered by standard configuration properties and secondly for those options which cannot be represented as a configuration option. * Add a sentence to READMEs of those functions which make use of `ComponentCustomizer` with an expected generic argument type * Add README into `rabbit-supplier` where it is fully missed at the moment
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