[bisq-network/bisq] Obtain minimumFee from mempool api in place of hardcoded value (#5235)

[jmacxx]

Fixes #5229

**example data from mempool api:**

    {"fastestFee":35,"halfHourFee":28,"hourFee":25,"minimumFee":6}


**Bisq pricenode obtains fee info:**

    Feb-24 22:10:45.291 [Timer-25] INFO  b.p.m.p.MempoolFeeRateProvider$First: Retrieved estimated mining fee of 28 sat/vB and minimumFee of 12 sat/vB from mempool.space 
    Feb-24 22:10:45.500 [Timer-25] INFO  b.p.m.p.MempoolFeeRateProvider$Fourth: Retrieved estimated mining fee of 27 sat/vB and minimumFee of 12 sat/vB from mempool.bisq.services 
    Feb-24 22:10:46.767 [Timer-25] INFO  b.p.m.p.MempoolFeeRateProvider$Second: Retrieved estimated mining fee of 27 sat/vB and minimumFee of 12 sat/vB from mempool.emzy.de 
    Feb-24 22:10:47.307 [Timer-25] INFO  b.p.m.p.MempoolFeeRateProvider$Third: Retrieved estimated mining fee of 27 sat/vB and minimumFee of 12 sat/vB from mempool.ninja 

---

**averaged fee data published by PriceNode:**

    {
      "bitcoinFeesTs" : 1614226269,
      "dataMap" : {
        "btcTxFee" : 27,
        "btcMinTxFee" : 12
      }
    }



---

**Bisq app obtains fee from PriceNode:**

    INFO  b.core.provider.fee.FeeService: BTC tx fee: txFeePerVbyte=27 minFeePerVbyte=12 

---

**Bisq withdrawal fee rate in settings screen cannot be set below the minFeePerVbyte**

![image](https://user-images.githubusercontent.com/47253594/109102970-912f7580-76ef-11eb-9431-4459a7f0c854.png)


You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/5235

-- Commit Summary --

  * Obtain minimumFee from mempool api in place of hardcoded value

-- File Changes --

    M core/src/main/java/bisq/core/provider/fee/FeeProvider.java (4)
    M core/src/main/java/bisq/core/provider/fee/FeeService.java (6)
    M core/src/main/java/bisq/core/user/Preferences.java (6)
    M desktop/src/main/java/bisq/desktop/main/settings/preferences/PreferencesView.java (2)
    M pricenode/src/main/java/bisq/price/mining/FeeRate.java (8)
    M pricenode/src/main/java/bisq/price/mining/FeeRateService.java (8)
    M pricenode/src/main/java/bisq/price/mining/providers/MempoolFeeRateProvider.java (41)
    M pricenode/src/test/java/bisq/price/mining/FeeRateServiceTest.java (2)
    M pricenode/src/test/java/bisq/price/mining/providers/MempoolFeeRateProviderTest.java (2)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/5235.patch
https://github.com/bisq-network/bisq/pull/5235.diff

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