[Feature] Add a graphman command to re-create full-text-search columns (tsvector)

Description

Reasoning: We hit an issue where some entries in a full-text-search column were actually null.

While the cause is unknown and that situation may not be relevant to other indexers (?), the fix was actually trivial:

update sgdXXX.subgraph_meta set 
subgraph_metadata_search = to_tsvector('english', COALESCE(display_name,'')) || to_tsvector('english', COALESCE(description, ''))
where subgraph_metadata_search is null

This mechanism (as well as searching for null values in that fulltext-search columns, for sanity checking), could easily be implemented in graphman for the next person who hits this.

Are you aware of any blockers that must be resolved before implementing this feature? If so, which? Link to any relevant GitHub issues.

No response

Some information to help us out

• Tick this box if you plan on implementing this feature yourself.
• I have searched the issue tracker to make sure this issue is not a duplicate.

从 graphman 命令的入口点开始，检查数据库维护命令的结构。使用 issue 中用于更新 tsvector 和检查 null 的 PostgreSQL 查询作为行为参考；当 graphman 能够重新创建全文搜索列并识别 null 值时，即表示完成。未指定文件路径或测试路径，并且 issue 表明其作者计划实现它。