feat: override dynamodb config

[thomas-chauvet]

Description

This PR add the possibility to override dynamoDB configuration via storage_options:

• AWS_ENDPOINT_URL_DYNAMODB overrides AWS_ENDPOINT_URL,
• AWS_REGION_DYNAMODB overrides AWS_REGION,
• AWS_ACCESS_KEY_ID_DYNAMODB overrides AWS_ACCESS_KEY_ID,
• AWS_SECRET_ACCESS_KEY_DYNAMODB overrides AWS_SECRET_ACCESS_KEY.

It solves cases where we use an S3-compatible storage without mutual exclusion but we want to use DynamoDB anyway as a locking provider. It also solves the case where we want to pass different credentials or region for S3 and dynamoDB.

Related Issue(s)

• closes #2497
• closes #2287

Documentation

Documentation has been updated to explain how to override configuration.

[github-actions[bot]]

ACTION NEEDED

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[thomas-chauvet]

Issue with DCO, I'll re-open a PR ASAP.