[Vault POC] Implement all available methods with Vault provider

	•	https://babylonlabs.atlassian.net/wiki/spaces/BABYLON/pages/275644435/WIP+JSON+RPC+API
	•	#trustless-vault-protocol-dev

Align with the protocol devs on the exact API interface for these calls.

Scope of this ticket:
	1.	Implement all methods required for interaction with the vault provider.
	2.	Run locally to verify requests and responses are working as expected.

