feat: add AWS SSM Parameter Store adapter

[cryptiklemur]

Adds an AWS SSM Parameter Store adapter, mirroring the existing AWS Secrets Manager adapter.

What

• New package secretary/aws-ssm-parameter-store-adapter (src/Adapter/AWS/SSM/), class AWSSSMParameterStoreAdapter
• Maps getSecret/putSecret/deleteSecret onto SSM getParameter/putParameter/deleteParameter
• No new composer dependency (the monolithic aws/aws-sdk-php already ships Aws\Ssm)

Behavior

• Value encoding identical to the Secrets Manager adapter: array -> json_encode on write, isJson-then-json_decode with raw fallback on read
• Writes default to Type => SecureString with Overwrite => true; caller options override
• Missing parameter surfaces as SecretNotFoundException (keyed on SsmException::getAwsErrorCode() === 'ParameterNotFound', other SSM exceptions rethrown)
• Implements the four configure*Options resolvers

Tests

• New PHPUnit + mockery test (Tests/AWSSSMParameterStoreAdapterTest.php): 6 passing, full suite 13/13 green
• psalm clean on the adapter, ecs clean

[github-actions]

🎉 This PR is included in version 4.4.0 🎉

The release is available on GitHub release

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