[bisq-network/bisq] Extend FeeRateService to support multiple API endpoints (#4247)

[cd2357]

FYI for reviewers: I realise its a relatively big change, so here's a short "changelog" to help with the review:

* `build.gradle`
  * added test dependencies for Jupiter
* `README.md`
  * added short description of how the endpoints can be configured
* `FeeRateService`
  * before: get fee rate from provider
  * now
     * get fee rates from all available providers + calculate average
     * fallback to `BitcoinFeeRateProvider.MIN_FEE_RATE` if providers are (temporarily) unreachable
* `BitcoinFeeRateProvider`
  * convert to abstract class
  * define five subclasses of it, each with its own endpoint API, which represent the diffeent providers
  * annotate subclasses so that they are only instantiated when endpoint URL is defined
  * first subclass defaults to mempool.space in case nothing else is defined (or config is corrupted)
* `application.properties`
  * extend file with 5 properties (API endpoints for supported fee providers)
* the rest are tests

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