feat: lambda-promtail, Added support for parsing s3 access logs

[jwitrick]

What this PR does / why we need it:

Currently the lambda promtail code does not support processing of s3 server access logs. This PR allows for processing of s3 server access log files (of type plaintext) and sending the parsed log entries to promtail/loki.

Please note, due to how the existing getLabels function is written the path format for the access logs has to be AWSLogs/s3AccessLogs/ if s3AccessLogs is omitted then the path will match more than 1 regex and cause unexpected failures.

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR