Fix BountyType with new PalletBountiesBounty

[TarikGul]

The polkadot-js api update with the substrate types in the most recent release 15.2.1 has introduced a break in the TS compiler.

The old type: Bounty

The new type: PalletBountiesBounty

The new type has already existed and is the return value for bounty.bounties for a while. But seems as if there is some underlying sub type that has changed and is causing issues. The PR which introduces this change is #11191.

For now I have added a bunch of type casts to ensure that the ts compiler doesn't break, this should be addressed in a follow up PR.

[TarikGul]

It is important to note, when we update for the new type we should:

1. find the underlying differences between the types.

2. ensure that we have forward and backwards compatibility so we don't break any chains still using the older bounty pallet versions.

[polkadot-js-bot]

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