Optional net_peerCount response format

[tgmichel]

There are inconsistencies on the response format expected when calling net_peerCount. Some tools/dapps expect decimal format, others hex.

This PR adds a bool peer_count_as_hex parameter to NetApi, so projects instantiating the handler at service level can decide which format to use. Defaulted to false in the template.

[notlesh]

@sorpaas Since we've gone back and forth on the return type for this, what do you think about this solution? We're hoping to put out a new moonbeam release soon and would love to be as close to master as possible.

[sorpaas]

The PR looks fine, but honestly I think if Ethereum dapps expect different types themselves, then that's not really much we can do. We just have to make sure by default we follow Geth's type definition.

[tgmichel]

The PR looks fine, but honestly I think if Ethereum dapps expect different types themselves, then that's not really much we can do. We just have to make sure by default we follow Geth's type definition.

Yeah, I will re-open tomorrow, we realized was missing untagged for serializing the enum correctly. I will also make sure that we default to Geth's format, thanks for pointing that out.