OTLP Logs: Deploy a log agent which tails logs and maps them to OTLP

[a-thaler]

Description

As part of #556 the support for tailing application logs from the container runtime is needed. This is essential to achieve feature parity with the current solution based on fluentbit.

Criterias

• If the application input gets enabled together with an OTLP output, the new log agent gets deployed
• The application input is enabled by default
• The agent will collect all application logs as it was the case with fluenbit (using selectors)
• The agent will pars json formats if possible
• The agent will enrich severity and timestamp OTLP attributes
• The body contain either the JSON msg/message attribute or the raw payload
• Support of "keepRawPayload" feature by having an additional log attribute with the raw payload
• The agent might stay deployed if the input gets disabled
• Kubernetes attribute enrichment should work in conjunction with the gateway
• Metric collection for operations should work (have a metric service and peerauthentication in place)