feat: drop connector for table with connector

[tabVersion]

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What's changed and what's your intention?

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• I have written necessary rustdoc comments.
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Release note

new syntax for dropping connector part of a table

only allow for table with associate source, not works for plain table and CDC table.

ALTER TABLE <table name> DROP CONNECTOR;

[tabVersion]

replacement for #19871

[BugenZhao]

Can you also test the behavior on tables with external-resolved schema (i.e., schema registry)? I believe #20131 will be a pre-requisite.

[fuyufjh]

Is this shared source? Can you also add a test case for some non-shared source?

[tabVersion]

The feature is dedicated to table with a connector (dedicate source). I believe the source behavior remains the same.

[gru-agent]

This pull request has been modified. If you want me to regenerate unit test for any of the files related, please find the file in "Files Changed" tab and add a comment @gru-agent. (The github "Comment on this file" feature is in the upper right corner of each file in "Files Changed" tab.)

[tabVersion]

Can you also test the behavior on tables with external-resolved schema (i.e., schema registry)? I believe #20131 will be a pre-requisite.

I know it has been a while, added now. Happy CNY.