Arbitration interfaces and SDK v2 improvements

[jaybuidl]

Modern alternative to the Archon SDK which

• consolidates the experience learned from integrated many protocols.
• provides a more consistent and opinionated approach to request and obtain arbitration from the court.
• improves DX.

### Tasks
- [ ] https://github.com/kleros/kleros-v2/issues/1082
- [ ] https://github.com/kleros/kleros-v2/issues/1083
- [ ] https://github.com/kleros/kleros-v2/issues/1111
- [ ] https://github.com/kleros/kleros-v2/issues/1081
- [ ] https://github.com/kleros/kleros-v2/issues/1103
- [ ] https://github.com/kleros/kleros-v2/issues/1475
- [ ] https://github.com/kleros/kleros-v2/issues/1352