Support create index on unique value column

[yangzhg]

Proposed changes

Support create index on unique value column, accelerate the scan of update, part of #5270

Types of changes

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• [] Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• [] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [] Documentation Update (if none of the other choices apply)
• [] Code refactor (Modify the code structure, format the code, etc...)

Checklist

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• I have created an issue on ([Proposal]Doris UNIQUE table supports UPDATE syntax #5270) and described the feature there in detail
• [] Compiling and unit tests pass locally with my changes
• [] I have added tests that prove my fix is effective or that my feature works
• [] If these changes need document changes, I have updated the document
• [] Any dependent changes have been merged

Further comments

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[EmmyMiao87]

Does adding an index to the value column only require development restrictions?
No other changes needed?

[yangzhg]

Does adding an index to the value column only require development restrictions?
No other changes needed?

All columns have the ability to create indexes, but it is prohibited when fe planning the exec plan

[EmmyMiao87]

LGTM