feat(node-rewards-canister): Add versioning on rewards calculation algorithm

[pietrodimarco-dfinity]

This pull request introduces versioning support for the node rewards calculation algorithm. The main goal is to allow clients to specify which version of the rewards calculation algorithm to use, and to make the API forward-compatible as new algorithm versions are introduced. The changes add a RewardsCalculationVersion struct, update API request and response types to include the version, and refactor the calculation logic to support multiple algorithm versions (currently only v1 is implemented).

[github-actions]

This pull request changes code owned by the Governance team. Therefore, make sure that
you have considered the following (for Governance-owned code):

1. Update unreleased_changelog.md (if there are behavior changes, even if they are
   non-breaking).

2. Are there BREAKING changes?

3. Is a data migration needed?

4. Security review?

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Brief Guide to "Externally Visible" Changes

"Externally visible behavior change" is very often due to some NEW canister API.

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Reference(s)

For a more comprehensive checklist, see here.

GOVERNANCE_CHECKLIST_REMINDER_DEDUP

No external changes since not prod yet