Bugfix/eja eli 306 adding kms decrypt for lambda rules bucket

[eddalmond1]

Description

Adding in KMS decrypt permissions for the rules bucket to the Lambda. Did some mild refactoring to split out permissions per bucket/service

Context

Needed to pull in rules

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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