chore: rename change to modify

[CookiePieWw]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

proto: https://github.com/GreptimeTeam/greptime-proto/pull/200

What's changed and what's your intention?

Just a rename.

Rename ChangeColumnType to ModifyColumnType to match it with SQL syntax.

Checklist

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

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.71429% with 10 lines in your changes missing coverage. Please review.

Project coverage is 83.76%. Comparing base (42bf7e9) to head (249efb5). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5000 +/- ## ========================================== - Coverage 84.03% 83.76% -0.27% ========================================== Files 1146 1146 Lines 213828 214002 +174 ========================================== - Hits 179690 179265 -425 - Misses 34138 34737 +599 ```

[CookiePieWw]

Captured db#5000 and proto#200 flag! Quite lucky for me :)

[WenyXu]

Captured db#5000 and proto#200 flag! Quite lucky for me :)

Interesting😜