perf: evolve promql execution engine

[waynexia]

Signed-off-by: Ruihang Xia [email protected]I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

100x performance improvement and 40x memory reduction by eliminating all potential sorts, and parallelizing as much as possible.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[killme2008]

Good job!

[killme2008]

I've added a few comments. LGTM!