Create Datacap Faucet for calibnet

[LesnyRumcajs]

Summary

The approach is almost identical to FIL sending, with the caveat that we need to serialize a AddVerifiedClientParams struct with two fields. Then it is sent via mpool. See this code.

Serializing logic could be likely copied from Forest (it might be possible to even avoid this).

While some of the logic will be shared (calling mpool on remote RPC provider), a new page for calibnet datacap will need to be created. This can be inspired by the existing faucet sending.

Completion Criteria

• Datacap Faucet is listed in https://forest-explorer.chainsafe.dev/faucet
• Rate limiting is in place, similar to FIL faucet
• Logic duplication is minimal

Additional Links & Resources