feat: test http server api

[killme2008]

Test http server APIs.

[codecov]

Codecov Report

Merging #21 (5786450) into develop (8cc10b3) will increase coverage by 0.68%.
The diff coverage is 85.71%.

@@             Coverage Diff             @@
##           develop      #21      +/-   ##
===========================================
+ Coverage    33.50%   34.18%   +0.68%     
===========================================
  Files           64       64              
  Lines         4008     4054      +46     
===========================================
+ Hits          1343     1386      +43     
- Misses        2665     2668       +3     

Flag	Coverage Δ
rust	34.18% <85.71%> (+0.68%)	⬆️

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

Impacted Files	Coverage Δ
src/datanode/src/server.rs	0.00% <ø> (ø)
src/datanode/src/server/http.rs	62.00% <83.33%> (+17.88%)	⬆️
src/datanode/src/lib.rs	100.00% <100.00%> (ø)
src/sql/src/parser.rs	17.96% <0.00%> (+0.08%)	⬆️
src/common/recordbatch/src/util.rs	92.50% <0.00%> (+0.60%)	⬆️
src/common/base/src/bytes.rs	30.55% <0.00%> (+30.55%)	⬆️
src/common/recordbatch/src/recordbatch.rs	93.33% <0.00%> (+73.33%)	⬆️

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