Add support to System Manager and Key Management Service about serverless-permission-generator

[rvanlaarhoven]

The following should be enough to read and decrypt SSM parameters

- Effect: Allow
  Action:
    - ssm:DescribeParameters
    - ssm:GetParameter
    - ssm:GetParameters
    - ssm:GetParametersByPath
  Resource: '*'
- Effect: Allow
  Action:
    - kms:Decrypt
  Resource: '*'

[nadunindunil]

Hi @StErMi ,

I have these system manager policies. Can you share any Key manager related policies if you have any,

Parameter store related policies:

- Effect: Allow
                Action:
                  - ssm:PutParameter
                  - ssm:DeleteParameter
                  - ssm:GetParameterHistory
                  - ssm:GetParametersByPath
                  - ssm:GetParameters
                  - ssm:GetParameter
                  - ssm:DeleteParameters
                  - ssm:DescribeParameters
                Resource: "*"

[nadunindunil]

Hi @StErMi / @rvanlaarhoven ,
I submitted a PR with suggestions please take a look at #16
Thank you

[nadunindunil]

Close the issue with PR merge