Support ALTER MODIFY SETTING for Memory tables

[zhongyuankai]

close #61922

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• New Feature

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

Modifying memory table settings through ALTER MODIFY SETTING is now supported.

ALTER TABLE memory MODIFY SETTING min_rows_to_keep = 100, max_rows_to_keep = 1000;

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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[robot-clickhouse-ci-2]

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[yariks5s]

Interesting to add some cases in tests:

• when initially we have max_bytes_to_keep/max_rows_to_keep = x and we set max_bytes_to_keep/max_rows_to_keep = y, y < x. Good to check if everything is working right and we have a smaller circular buffer.
• when initially we have a memory table with no settings and we apply these settings to this table.
• when initially we don't have min_bytes_to_keep/min_rows_to_keep settings for the table and add them with ALTER. Also good to check if min settings are changed correctly
• when we try to set incorrect values for those settings

[zhongyuankai]

Related tests have been added.