feat(x/evmstaking): ubi auto withdraw

[ezreal1997]

check ubi balance and perform auto withdraw if meets the threshold which is same as rewards withdraw

issue: none

[ezreal1997]

What's different from other withdraw entries is we pass the empty string for delegatorAddress and validatorAddress in ubi withdraw entry.

// Add withdrawal entry to the withdrawal queue.
if err = k.AddWithdrawalToQueue(ctx, types.NewWithdrawal(
	uint64(blockHeight),
	"",
	"",
	params.UbiWithdrawAddress,
	ubiBalance.Uint64(),
)); err != nil {
	return nil, err
}

it's good since we only use EVMAddress here

[github-actions]

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