feat: export all schemas and data at once in export tool

[fengjiachun]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

1. export all schemas and data at once in export tool
2. remove export table data cmd, use database data instead.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

[coderabbitai]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.64%. Comparing base (90301a6) to head (1746b58).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4478      +/-   ##
==========================================
- Coverage   84.88%   84.64%   -0.24%     
==========================================
  Files        1081     1081              
  Lines      193177   193224      +47     
==========================================
- Hits       163971   163552     -419     
- Misses      29206    29672     +466     

[killme2008]

What's purpose of this tool? To export a database?

[fengjiachun]

What's purpose of this tool? To export a database?

It can export a database (including schema and data), or it can export all databases under a catalog.

[fengjiachun]

@killme2008 PTAL

[WenyXu]

LGTM

[WenyXu]

Coverage is failed

[killme2008]

Do we have any tests for this tool?

[fengjiachun]

Do we have any tests for this tool?

There is already a unit test for export schema

greptimedb/src/cmd/src/cli/export.rs

Line 495 in 1746b58

async fn test_export_create_table_with_quoted_names() -> CmdResult<()> {

However, testing for export data might be challenging. Once we provide the import tool, this test should become easier.

[killme2008]

Do we have any tests for this tool?

There is already a unit test for export schema

greptimedb/src/cmd/src/cli/export.rs

Line 495 in 1746b58

async fn test_export_create_table_with_quoted_names() -> CmdResult<()> {

However, testing for export data might be challenging. Once we provide the import tool, this test should become easier.

Got，we need a greptime cli import command.

[killme2008]

LGTM