Publish-AWSPowerShellLambda missing credential parameter

All other PowerShell cmdlet support -credential parameter (https://docs.aws.amazon.com/powershell/latest/reference/Index.html)
I don't see a reason for this to not do this as well.

## Describe the Feature
Add -credential parameter

-Credential
Required? | False
-- | --
Position? | Named
Accept pipeline input? | True (ByValue, ByPropertyName)

### Is your Feature Request related to a problem?
No

### Describe alternatives you've considered
Manually setting and managing Credentials using Set-AWSCredential

## Additional Context

### Environment

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This is a :rocket: Feature Request