Enhancement - SSM Version Support

[terrancej]

I would like to be able to choose the version of a SSM parameter. Such that:
ref+awsssm://PATH/TO/PARAM[?region=REGION][?version=VERSION]

Creating a PR for this

[terrancej]

I'll update the README.

@mumoshu thoughts on
https://github.com/variantdev/vals/blob/a611e82bc24b845fa97953bfdc728749bc06083b/pkg/providers/ssm/ssm.go#L59 &
https://github.com/variantdev/vals/blob/a611e82bc24b845fa97953bfdc728749bc06083b/pkg/providers/ssm/ssm.go#L99

I was testing on my local Helmfile with the updated vals and I get the following. I'd love to suppress the output. I see that some other providers don't have a log line but maybe there is value in being able to see the value being pulled. I just don't want credentials in my CI logs

# tail from helmfile template
...
Deleting outdated charts

foo.yaml: basePath=.

hook[prepare] logs | namespace/foo unchanged
hook[prepare] logs | 
SSM: successfully retrieved key=bar

[mumoshu]

@terrancej Thanks! I'm trying to isolate the cause. Are you giving helmfile a --log-level=debug flag?

[mumoshu]

I've realized that SSM: successfully retrieved key=bar is logged vals and I made it togglable via a variable in #120.
Perhaps we can set the variable from helmfile or add a field to the vals runtime struct for toggling and set it from helmfile to suppress the logs.

[mumoshu]

The fix is going to be live via v0.23.0!