feat: handle PromQL HTTP API parameters

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Add start, end and step's parser part to promql's EvalStmt. And process them in the exposed HTTP API.

Notice that the lookback in promql is set in something like query context. We may expose it in the HTTP API in the future, but for this PR it's ignored.

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)

[codecov]

Codecov Report

Merging #985 (be56dc8) into develop (e17d564) will decrease coverage by 0.04%.
The diff coverage is 93.51%.

@@             Coverage Diff             @@
##           develop     #985      +/-   ##
===========================================
- Coverage    86.01%   85.97%   -0.04%     
===========================================
  Files          436      436              
  Lines        62930    63084     +154     
===========================================
+ Hits         54128    54236     +108     
- Misses        8802     8848      +46     

Flag	Coverage Δ
rust	85.97% <93.51%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
src/frontend/src/instance/distributed.rs	87.67% <0.00%> (ø)
src/frontend/src/instance/standalone.rs	61.70% <0.00%> (ø)
src/servers/src/http.rs	78.01% <0.00%> (ø)
src/servers/src/query_handler/sql.rs	58.92% <42.85%> (+22.39%)	⬆️
src/frontend/src/instance.rs	80.07% <50.00%> (+0.56%)	⬆️
src/datanode/src/instance/sql.rs	80.85% <95.23%> (+1.15%)	⬆️
src/query/src/parser.rs	97.76% <100.00%> (+4.11%)	⬆️
src/servers/src/http/handler.rs	72.28% <100.00%> (+22.97%)	⬆️
src/servers/src/promql.rs	50.71% <100.00%> (+2.20%)	⬆️
src/object-store/src/test_util.rs	0.00% <0.00%> (-100.00%)	⬇️
... and 13 more

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[killme2008]

LGTM