Support inline context for Rage::Logger

[rsamoilov]

This pull request adds support for passing inline context (key-value pairs) directly to logger methods, allowing additional metadata to be attached to log entries.

Before:

Rage.logger.with_context(user_id: current_user.id) do
  Rage.logger.info "User logged in"
end

After:

Rage.logger.info "User logged in", user_id: current_user.id