[bisq-network/bisq] Add parsing to pricenode cmdline inputs (#4112)

[Florian Reimair]

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Stumbled over during https://github.com/bisq-network/bisq/pull/4027

This PR adds basic input validation and correction for the custom pricenode command line parameter:
- `--help` says
```
  --providers=<host:port[,...]>
        List custom pricenodes
```
- yet, setting the value to `44mgyoe2b6oqiytt.onion:80` fails.
- because the correct formatting requires "http" in front and a "/" at the end

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

  https://github.com/bisq-network/bisq/pull/4112

-- Commit Summary --

  * Add parsing to pricenode cmdline inputs

-- File Changes --

    M core/src/main/java/bisq/core/provider/ProvidersRepository.java (2)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4112.patch
https://github.com/bisq-network/bisq/pull/4112.diff

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