Fix AWS Data API timezone handling in Drizzle ORM

Problem

AWS Data API returns timestamps without timezone indicators (e.g., "2024-01-15 10:30:00.123"), causing Drizzle to incorrectly interpret UTC timestamps as local time. This results in wrong relative times like "in 3 hours" instead of "3 hours ago".

Solution

Enhanced mapFromDriverValue in PgTimestamp to detect timezone indicators using regex /[+-]\d{2}:?\d{2}$|Z$/. When timestamptz columns lack timezone info, automatically append 'Z' to force UTC interpretation.

Before:

mapFromDriverValue = (value) => {
    return new Date(this.withTimezone ? value : value + '+0000');
};

After:

mapFromDriverValue = (value) => {
    const hasTimezone = /[+-]\d{2}:?\d{2}$|Z$/.test(value);
    
    if (this.withTimezone && !hasTimezone) {
        return new Date(value + 'Z'); // Force UTC for AWS Data API
    }
    
    return new Date(this.withTimezone ? value : value + '+0000');
};

Impact

• ✅ Fixes AWS Data API timezone interpretation
• ✅ Maintains full backward compatibility
• ✅ Minimal performance impact (single regex test)
• ✅ No breaking changes

Type of Change

• Bug fix (AWS Data API compatibility)
• Enhancement (improved timezone handling)

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