Make Drivers Simpler

[pseudomuto]

• Extract shared NeedsQuoting function to driver.go
• Standardize SupportsFeature implementation using supportedFeatures slices across all drivers
• Reorganize file structure to follow consistent patterns (grouped type declarations)
• Maintain identical functionality while improving maintainability

[Copilot]

Pull Request Overview

Simplify and standardize driver implementations by centralizing common identifier quoting logic and unifying feature support checks across drivers.

• Extract common NeedsQuoting logic into a shared function in driver.go
• Replace switch-based SupportsFeature implementations with standardized supportedFeatures slices and slices.Contains checks
• Minor structural cleanup using grouped type declarations

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
drivers/postgres/postgres.go	Switch to where.NeedsQuoting and introduce supportedFeatures with slices.Contains for SupportsFeature
drivers/mysql/mysql.go	Switch to where.NeedsQuoting and introduce supportedFeatures with slices.Contains for SupportsFeature
drivers/clickhouse/clickhouse.go	Switch to where.NeedsQuoting and introduce a features slice; unify SupportsFeature via slices.Contains
driver.go	Add grouped type declaration and introduce shared NeedsQuoting function used by all drivers

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