Add SecureString for PushString to AWS Parameter Store

[meysam81]

Is your feature request related to a problem? Please describe.
I'm baffled as to why this is not a customizable flag in the PushSecret.spec to set the parameter type for AWS SSM Parameter Store.
This is the offending line:

external-secrets/pkg/provider/aws/parameterstore/parameterstore.go

Line 141 in e32bc39

parameterType := "String"

This should obviously be something the client should be able to customize, with the default of String if you really want it. But, nevertheless, it shouldn't be a hard-coded value.

Describe the solution you'd like
I'd like to be able to modify the value to SecureString please. On the same topic, you should also be able to set the Parameter Tier of either Standard or Advanced. reference

Describe alternatives you've considered
The alternative is to fork the repo and modify it to have the default hard-coded value of SecureString (cause I'm not a Go guy by any means 😬).

Additional context
nada

[gusfcarvalho]

To whoever pick up this issue - this change should be done on SecretStore CRDs, where a flag can be set and then consumed (instead of the current hard coded value).

[crabique]

For SecureString it would also require specifying the encryption KMS key ID for cases where a non-default key should be used.

[vsantos]

Can I work on this improvement?

[Skarlso]

Sure. Go ahead!