Merge feature/add-partial-withdrawals

## Summary

This PR will add EL request functionality for partial withdrawal and
validator exits. Furthermore it will add hoodi support.

## Details

* add subcommand `withdraw` for partial withdrawals
* add subcommand `exit` for validator exits
* add network option `hoodi`
* clean-up possible network options
* add disclaimer log for missing sanity checks

closes #6
closes #2
closes #26 
closes #25

Merge feature/add-devnet-7-support

Merge feature/add-public-devnet-configs

* Add public testnet configs
* Add mainnet config

Merge hotfix/fix-secret-loadin

feat(service): Add backend implementation

* Add cli-validation
* Add domain logic
* Add ethereum related service
* Add prompt service