feat: cloudwatch logging

[jacobtread]

Description

Adds support for logging using cloudwatch

Adds the following configuration environment variables:

• DOCBOX_CLOUDWATCH_LOG_GROUP_NAME - The cloudwatch log group name to log into (Required for cloudwatch)
• DOCBOX_CLOUDWATCH_LOG_STREAM_NAME - The cloudwatch log stream to log into (Required for cloudwatch)
• DOCBOX_CLOUDWATCH_LOG_BATCH_SIZE - Batch size that when reached should trigger a flush of logs
• DOCBOX_CLOUDWATCH_LOG_INTERVAL_SECONDS - Interval in seconds to flush logs at regardless of how many are in the queue

Changes

• Added cloudwatch logging layer
• Added cloudwatch configuration