Add claimedRewardsEra to api.derive.staking.query for compatibility with legacyClaimedRewards

[TarikGul]

Summary

StakingQueryFlags

Now takes in a new flag: withClaimedRewardsEras. This flag returns all the claimedRewards eras based on the new storage entry ClaimedRewards.

api.derive.staking.electedInfo:

Adds a 3rd param for page.

api.derive.staking.query && api.derive.staking.queryMulti

Returns a new field claimedRewardsEras when withClaimedRewardsEras is true. This is for compatibility reasons for legacyClaimedRewards.

Fix api.derive.staking.stakingRewards

Now takes into account claimedRewards storage key to ensure all eras are accounted for.

TODO:

• Get the observable working in query
• Fix claimedRewards in stakerRewards
• Fix electedInfo

[polkadot-js-bot]

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