Sdk: add claim rewards

[emccorson]

Closes #679.

---

Added

• Support claim rewards tx in SDK

Testing

1. Stake some NAM.
2. Check that you have rewards available with namadac rewards.
3. In Namadillo, add window.sdk = sdk; window.BigNumber = BigNumber; and then in the console something like:

   
   var built = await sdk.tx.buildClaimRewards(
   {
   token: sdk.nativeToken,
   feeAmount: BigNumber(0),
   gasLimit: BigNumber(20_000),
   chainId: "localnet.4918ab9bafd7c5a6ac91c",
   publicKey: "tpknam1qptrn64myunqr4847yq4cn0uwek5ecwc7eeexjfc5npmd5kmg6ex563n5as"
   },
   {
   validator: "tnam1q9vhfdur7gadtwx4r223agpal0fvlqhywylf2mzx",
   source: "tnam1qz4sdx5jlh909j44uz46pf29ty0ztftfzc98s8dx"
   }
   );

var signed = await namada.sign({ txType: built.tx.tx_type(), signer: "tnam1qz4sdx5jlh909j44uz46pf29ty0ztftfzc98s8dx", tx: { txBytes: built.tx.tx_bytes(), signingDataBytes: built.tx.signing_data_bytes(), }, wrapperTxMsg: built.tx.wrapper_tx_msg() });

var processed = await sdk.rpc.broadcastTx({ wrapperTxMsg: built.tx.wrapper_tx_msg(), tx: signed })

4. Refresh Namadillo and check that your balance has increased.

[github-actions[bot]]

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