feat: support export data

[TDroyal]

What problem does this PR solve?

1.Issue Number: fix #10 #14 .

What is changed and how it works?

支持数据导出到本地和远程数据库

>ts-cli export -h
2025-09-03 11:04:56.8120923 +0800 CST m=+0.025423501 init logger, conf: {app:single Format:auto Level:info MaxSize:67108864 MaxNum:16 MaxAge:7 CompressEnabled:true Path:/home/royal_111/.openGemini/logs}
(EXPERIMENTAL) Export data from openGemini to file or remote
Usage:
ts-cli export [flags]
Examples:
        $ ts-cli export --format txt --out /tmp/openGemini/export/export.txt --data /tmp/openGemini/data --wal /tmp/openGemini/data
        --dbfilter NOAA_water_database
        $ ts-cli export --format csv --out /tmp/openGemini/export/export.csv --data /tmp/openGemini/data --wal /tmp/openGemini/data
        --dbfilter NOAA_water_database --mstfilter h2o_pH --timefilter "2019-08-25T09:18:00Z~2019-08-26T07:48:00Z"
        $ ts-cli export --format remote --remote ${host}:8086 --data /tmp/openGemini/data --wal /tmp/openGemini/data
        --dbfilter NOAA_water_database --mstfilter h2o_feet
Flags:
--compress                 Optional. Compress the export output.
--data string              Data storage path to export.
--dbfilter string          Database to export
--format string            Export data format, support csv, txt, remote. (default "txt")
-h, --help                     help for export
--mstfilter string         Optional.Measurement to export.
--out string               Destination file to export to.
--remote string            Remote address to export data.
-p, --remotepassword string    Remote export Optional.Password to connect to remote openGemini.
--remotessl                Remote export Optional.Use https for connecting to remote openGemini.
-u, --remoteusername string    Remote export Optional.Username to connect to remote openGemini.
--resume                   Resume the export progress from the last point.
--retentionfilter string   Optional. Retention policy to export.
--timefilter string        Optional.Export time range, support 'start~end'
--wal string               WAL storage path to export.

用法

1.支持将数据导出txt/csv格式，需要指定数据存储的data目录、wal目录以及数据库名称，可选参数：表名、保留策略、时间戳范围、压缩数据等

使用示例如下：

# 导出txt格式
ts-cli export --format txt --out /tmp/openGemini/export/export.txt --data /tmp/openGemini/data --wal /tmp/openGemini/data --dbfilter db31
# 导出csv格式
ts-cli export --format csv --out /tmp/openGemini/export/export.csv --data /tmp/openGemini/data --wal /tmp/openGemini/data --dbfilter db31
# 指定表名和时间戳范围
ts-cli export --format csv --out /tmp/openGemini/export/export.csv --data /tmp/openGemini/data --wal /tmp/openGemini/data --dbfilter db31 --mstfilter cpu --timefilter "2019-08-25T09:18:00Z~2019-08-26T07:48:00Z"
# 指定数据压缩
ts-cli export --format csv --out /tmp/openGemini/export/export.csv --data /tmp/openGemini/data --wal /tmp/openGemini/data --dbfilter db31 --mstfilter cpu --timefilter "2019-08-25T09:18:00Z~2019-08-26T07:48:00Z" --compress true

2.支持断点续传：导出任务中断后再次启动时，自动跳过已完成的 TSSP 文件（例如已导出 4/9 个文件），并从后续文件（第 5 个）继续导出，确保数据导出的幂等性和资源高效利用。

ts-cli export --format csv --out /tmp/openGemini/export/export.csv --data /tmp/openGemini/data --wal /tmp/openGemini/data --dbfilter db31 --resume true

3.支持将a节点的数据导出到b节点（跨数据库）

ts-cli export --format remote --remote ${host}:8086 --data /tmp/openGemini/data --wal /tmp/openGemini/data --dbfilter db31

Checklist:

✅ My code follows the style guidelines of this project
✅ I have performed a self-review of my own code
✅ I have commented my code, particularly in hard-to-understand areas
❌ I have made corresponding changes to the documentation
✅ My changes generate no new warnings
❌ I have added tests that prove my fix is effective or that my feature works
✅ New and existing unit tests pass locally with my changes
✅ Any dependent changes have been merged and published in downstream modules

[dosubot]

Related Documentation

1 document(s) may need updating based on files changed in this PR

• Documents

^{How did I do? Any feedback?}  

[xuthus5]

我们能否不依赖内核仓库，将依赖的公共代码抽离出来，减小构建体积。

[TDroyal]

@xuthus5 直接依赖的代码有的还会依赖其它代码，抽离出来可能也是一大堆文件，后续评估后可以考虑，目前考虑先以这样的方式。

[dosubot]

Documentation updates

Checked 2 published document(s). No updates required.

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