feat: support default value when inserting data

[lizhemingi]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

support default value when inserting data.

Please explain IN DETAIL what the changes are in this PR and why they are needed:

• Change Identifier without quoted to Placeholder instead of SingleQuotedString when inserting data.
• Replace Placeholder with default and DEFAULT value to the default value of corresponding column if possible.

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)

#759

[lizhemingi]

@killme2008 PTAL.

Sorry for the slow progress, since I was suffering from covid-19 and busy work last few weeks.

[codecov]

Codecov Report

Merging #854 (968a9da) into develop (6775c5b) will decrease coverage by 0.13%.
The diff coverage is 79.85%.

@@             Coverage Diff             @@
##           develop     #854      +/-   ##
===========================================
- Coverage    86.32%   86.18%   -0.14%     
===========================================
  Files          425      425              
  Lines        56097    56193      +96     
===========================================
+ Hits         48426    48431       +5     
- Misses        7671     7762      +91     

Flag	Coverage Δ
rust	86.18% <79.85%> (-0.14%)	⬇️

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

Impacted Files	Coverage Δ
src/datanode/src/error.rs	65.95% <0.00%> (-1.44%)	⬇️
src/frontend/src/error.rs	12.00% <0.00%> (-0.50%)	⬇️
src/sql/src/error.rs	80.64% <0.00%> (-1.33%)	⬇️
src/frontend/src/sql.rs	68.11% <54.54%> (-7.25%)	⬇️
src/datanode/src/sql/insert.rs	80.64% <57.14%> (-9.58%)	⬇️
src/sql/src/statements/insert.rs	79.54% <92.30%> (+9.17%)	⬆️
src/datatypes/src/schema/column_schema.rs	100.00% <100.00%> (ø)
src/sql/src/statements.rs	89.78% <100.00%> (+0.20%)	⬆️
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 6 more

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[killme2008]

@killme2008 PTAL.

Sorry for the slow progress, since I was suffering from covid-19 and busy work last few weeks.

Wish you health. We'll review it ASAP. Thanks a lot.

[lizhemingi]

@killme2008 @killme2008 Please take another look.

[killme2008]

LGTM

[waynexia]

Looks good to me, thanks @lizhemingi. I'll add some cases to sqlness test to cover this change.