Feature: support for plugglabe metrics suppliers about cassandra-exporter HOT 3 OPEN

Thanks for the PR @chicobento. I really like the idea of having dynamic providers. In fact, this could even be a good path forward to enabling compatibility with C* 4.0 (since it'll need a different set of collectors).

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I created an initial PR. Some other refactoring may be done such as providing the existing metrics in FactoriesSupplier via the FactoryProvider interface.

With this feature, the #74 issue is still more relevant, so that cassandra-exporter plugins can get the common.jar dependency for compilation via maven or gradle.

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Hi @zegelin , yes, I was thinking on splitting the core module from the 'default' collector provider lets say, but that would make the deployment a bit more tricky for now - however this could be something to consider with the C* 4.0 in the landscape.

Just so you know, I did some integration tests internally and it is working fine: my cassandra plugin metrics can be seen on the scrap interface.
Pls let me know your feedback on the PR and the minimal changes to get it merged - I might have some time to work on adjustments over the next days if needed.

ps: the company has intention on opening the code for the plugin, so both its core code and the cassandra-exporter integration should be available in github in near future

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