Allow certain ALTER TABLE commands for plain_rewritable disk

[jkartseva]

Currently, all alters are disallowed. This may be too restrictive for some use cases. Allow 'non-replicated' alter commands: MODIFY|RESET SETTING and MODIFY COMMENT.

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Allow ALTER TABLE .. MODIFY|RESET SETTING and ALTER TABLE .. MODIFY COMMENT for plain_rewritable disk.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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[clickhouse-ci]

This is an automatic comment. The PR descriptions does not match the template.

Please, edit it accordingly.

The error is: More than one changelog category specified: 'Bug Fix (user-visible misbehavior in an official stable release)', 'CI Fix or Improvement (changelog entry is not required)'

[robot-ch-test-poll1]

This is an automated comment for commit 81a7862 with description of existing statuses. It's updated for the latest CI running

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