feat: PromQL handler in query engine

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Implement other missing parts to make an EvalStmt executable by our query engine.

You can get the following result by ceil(demo{host="host1"}) (mocked) after this patch!

+---------------------+----------------+-------------------+
| ts                  | ceil(demo.cpu) | ceil(demo.memory) |
+---------------------+----------------+-------------------+
| 1970-01-01T00:00:00 | 67             | 1024              |
| 1970-01-01T00:00:05 | 67             | 4096              |
| 1970-01-01T00:00:10 | 100            | 20480             |
| 1970-01-01T00:00:50 | 12424          | 1334              |
| 1970-01-01T00:01:20 | 0              | 2334              |
| 1970-01-01T00:01:40 | 49             | 3334              |
+---------------------+----------------+-------------------+

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

#596

[codecov]

Codecov Report

Merging #861 (89ff0c7) into develop (9428e70) will increase coverage by 0.27%.
The diff coverage is 96.99%.

@@             Coverage Diff             @@
##           develop     #861      +/-   ##
===========================================
+ Coverage    86.09%   86.36%   +0.27%     
===========================================
  Files          421      422       +1     
  Lines        55549    55668     +119     
===========================================
+ Hits         47823    48079     +256     
+ Misses        7726     7589     -137     

Flag	Coverage Δ
rust	86.36% <96.99%> (+0.27%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/promql/src/error.rs	7.69% <ø> (ø)
src/promql/src/extension_plan/planner.rs	81.25% <81.25%> (ø)
src/query/src/query_engine/state.rs	86.53% <94.11%> (+1.48%)	⬆️
src/datanode/src/instance/sql.rs	80.76% <100.00%> (+0.33%)	⬆️
src/promql/src/planner.rs	87.77% <100.00%> (+1.02%)	⬆️
src/query/src/datafusion.rs	96.71% <100.00%> (+0.63%)	⬆️
src/query/src/parser.rs	95.45% <100.00%> (+4.15%)	⬆️
src/table/src/metadata.rs	97.27% <100.00%> (+0.01%)	⬆️
src/object-store/src/test_util.rs	0.00% <0.00%> (-100.00%)	⬇️
src/datanode/src/instance.rs	50.00% <0.00%> (-15.87%)	⬇️
... and 12 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[killme2008]

LGTM