[FR] - Expand action create-treasury-withdrawal to also take an optional scripthash

[CarlosLopezDeLara]

Internal/External
Internal if an IOHK staff member.
Area
Governance

Describe the feature you'd like

Expand action create-treasury-withdrawal command to also take an optional scripthash (the policy script, also called guardrails script) of the supplementary script of the constitution.

conway cddl: 
treasury_withdrawals_action = (2, { reward_account => coin }, policy_hash / null)

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 120 days.

[smelc]

Done by @Jimbo4350 in #529