feat(promql): supports quantile and count_values

[killme2008]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#5525

What's changed and what's your intention?

Impl quantile and count_values operator, for example:

quantile(0.8, http_total_requests)
count_values('status_code', http_total_requests)

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]

It's ready for review, please take a look @WenyXu @waynexia @evenyag