chore: add load example amd query CLI

[matthewmcneely]

Description

This PR adds a load example and a query cli

Checklist

• Code compiles correctly and linting passes locally

[Copilot]

Pull Request Overview

This PR introduces two new command-line tools—a loader for the 1million dataset and a query CLI—while updating existing logging calls to use the configured logger.

• Introduces a new load example CLI in the examples/load folder.
• Adds a query CLI in the cmd/query folder along with associated documentation.
• Updates logging calls in live_test.go, live.go, and client.go to consistently use the logger.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
load_test/live_test.go	Updates logging to use stdr logger for engine configuration.
live.go	Replaces standard logging with engine.logger for consistency.
examples/load/main.go	New loader CLI with download and progress tracking logic.
examples/load/README.md	Documentation for the new load CLI tool.
examples/basic/main.go	Adjusted verbosity flag parsing logic.
cmd/query/main.go	New query CLI implementation for executing DQL queries.
cmd/query/README.md	Documentation for the query CLI tool.
client.go	Modified QueryRaw to leverage engine namespace queries.
README.md	Updated CLI commands and example usage details.

Comments suppressed due to low confidence (1)

live.go:84

• [nitpick] Consider logging the 'rate' value as a numeric type rather than formatting it as a string using fmt.Sprintf, if the logger supports numeric values. This may enable better downstream processing and filtering of log data.

n.engine.logger.Info("Data loading progress", "elapsed", x.FixedDuration(elapsed), "quads", nqudsProcessed, "rate", fmt.Sprintf("%5.0f", rate))