Introduce a Max Number of Proposals for DAO Votes with Checkpoint Control

[deep-ink-ventures]

Currently, the maximum number of checkpoints in the asset pallet is too large, and we want to modify it similarly to the approach taken for Elio DAO. A maximum number of proposals (set at 25) will be introduced as a runtime configuration for DAO votes. This will allow assets to query votes based on the number of active proposals, and for a specific DAO token and user, there will always be (number of proposals for that DAO + 1) checkpoints, resulting in a maximum number of 26.

Add a chain extension, so not only the pallet assets, but as well ink contracts can get the current active proposals.

Definition of Done:

• A maximum number of proposals is set in the runtime configuration for DAO votes, limited to 25.
• Asset pallet is modified to query votes for the number of active proposals.
• For a specific DAO token and user, the system is able to maintain and control (number of proposals for that DAO + 1) checkpoints.
• Code changes are tested and align with the implementation found in Elio DAO at Elio DAO GitHub.
• Documentation is updated to reflect these changes.