feat: add cancelandwithdraw()

[g4titanx]

No description provided.

[ozwaldorf]

can we remove the old methods or just call them as internal funcs so the bytecode isn't duplicated

[EmperorOrokuSaki]

Agree with oz

[g4titanx]

can we remove the old methods or just call them as internal funcs so the bytecode isn't duplicated

yeah removed withdraw(), keeping requestcancellation() though because

• cancelAndWithdraw() reverts (BondActive) — can't withdraw mid-bond
• requestCancellation() succeeds — sets the flag so no new node can bond after the current one expires/collects

[ozwaldorf]

dont merge until frontend pr is ready - breaking changes introduced