feat: supports decimal type in RPC

[QuenKar]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

main change:

• Decimal128 grpc

refactor ColumnDataTypeWrapper

#[derive(Debug, PartialEq)]
pub struct ColumnDataTypeWrapper {
    datatype: ColumnDataType,
    datatype_ext: Option<ColumnDataTypeExtension>,
}

• ColumnDataTypeWrapper can convert with ConcreteDataType.(refactor From/TryFrom trait).
• we can use ColumnDataType::xxx_datatype() to create, as ConcreteDataType style.
• use datatype() can get (ColumnDataType, Option<ColumnDataTypeExtension>) , which is needed by ColumnSchema ,ColumnDef and Column.
• use try_new to construct a ColumnDataTypeWrapper.

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)

#2682
GreptimeTeam/greptime-proto#122

[codecov]

Codecov Report

Merging #2788 (9a67619) into develop (a7bbd61) will decrease coverage by 0.14%.
Report is 11 commits behind head on develop.
The diff coverage is 80.87%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2788      +/-   ##
===========================================
- Coverage    84.47%   84.34%   -0.14%     
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  Files          728      731       +3     
  Lines       113352   114517    +1165     
===========================================
+ Hits         95756    96587     +831     
- Misses       17596    17930     +334     

[evenyag]

I'll review the rest parts after the proto is updated.

[evenyag]

This PR adds a feature and not only refactors the ColumnDataTypeWrapper. @QuenKar Could you edit the title? And I think it actually supports decimal type in RPC.

[killme2008]

LGTM