chore: refacor ceresdb config

[chunshao90]

Which issue does this PR close?

Closes #

Rationale for this change

It is strange that DeployMode is placed in the top-level configuration, it needs to be placed in a sub-configuration.

What changes are included in this PR?

The service section in config is renamed to server.

Are there any user-facing changes?

The service section in config is renamed to server.

How does this change test

Manual testing.

[codecov-commenter]

Codecov Report

Merging #640 (2a35b48) into main (27b2c03) will decrease coverage by 0.02%.
The diff coverage is 48.48%.

@@            Coverage Diff             @@
##             main     #640      +/-   ##
==========================================
- Coverage   66.41%   66.40%   -0.02%     
==========================================
  Files         283      283              
  Lines       44261    44259       -2     
==========================================
- Hits        29397    29391       -6     
- Misses      14864    14868       +4     

Impacted Files	Coverage Δ
server/src/config.rs	27.82% <0.00%> (ø)
server/src/server.rs	0.00% <0.00%> (ø)
src/setup.rs	0.00% <0.00%> (ø)
sql/src/provider.rs	35.71% <76.92%> (+0.93%)	⬆️
query_engine/src/executor.rs	77.55% <100.00%> (-0.45%)	⬇️
table_engine/src/provider.rs	69.72% <100.00%> (-0.33%)	⬇️
interpreters/src/create.rs	87.50% <0.00%> (-4.17%)	⬇️
...nterpreters/src/table_manipulator/catalog_based.rs	97.22% <0.00%> (-0.93%)	⬇️
interpreters/src/tests.rs	95.72% <0.00%> (-0.72%)	⬇️
wal/src/rocks_impl/manager.rs	92.53% <0.00%> (-0.19%)	⬇️
... and 1 more

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[jiacai2050]

LGTM