Move common server utilities to clp-rust-utils

[coderabbitai]

Context

As discussed in #1675, we have identified several utility functions in the log-ingestor component that will likely be needed across multiple Rust components:

• read_config_and_credentials: Loads configuration from YAML files and credentials from environment variables
• set_up_logging: Sets up logging with hourly-rotating file appenders
• shutdown_signal: Handles graceful shutdown on SIGTERM or Ctrl-C

Proposal

Move these utilities to the clp-rust-utils crate to promote code reuse and consistency across Rust components.

References

• PR: feat(log-ingestor): Add HTTP server skeleton and config setup. #1675
• Requested by: @hoophalab