feat: allow endpoint overrides in AwsSecretsManagerVault

[chlorochrule]

What this PR changes/adds

AwsSecretsManagerVaultExtension do not allow to override AWS endpoint. However, S3CoreExtension allows it. So, I implements endpoint overrides in AwsSecretsManagerVault using edc.aws.endpoint.override the same param of S3CoreExtension.

Why it does that

For AWS-compatible services like localstack.

[github-actions]

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[paullatzelsperger]

@chlorochrule do NOT submit surprise PRs.
As per our PR Etiquette, a discussion or an issue must be created beforehand, to outline requirements, motivation and a technical approach for the work.

Committers will then triage the issue and approve it for implementation by removing the triage label. Once that is done you are good to go.

[chlorochrule]

@paullatzelsperger I apologize for the breaking etiquette, and thank you for pointing that out! I created a ticket #486