Add type processors for Time, Interval, UUID, and Enum

[CollierKing]

Summary

Following the pattern established by D1Boolean, D1LargeBinary, D1DateTime, and D1Date, we need custom type processors for additional SQLAlchemy types that would cause D1_TYPE_ERROR when used with Cloudflare D1.

D1 only accepts primitive bind parameters (string, number, null, ArrayBuffer). Python objects passed directly will raise:

D1_TYPE_ERROR: Type 'object' not supported for value '...'

Types needing processors

Time — HIGH priority

• Python datetime.time objects pass through unchanged → D1_TYPE_ERROR
• Fix: D1Time processor converting to/from ISO 8601 strings (HH:MM:SS)
• Same pattern as D1Date and D1DateTime

UUID — MEDIUM priority

• Python uuid.UUID objects may pass through unchanged → D1_TYPE_ERROR
• Fix: D1UUID processor converting to/from string (.hex or hyphenated format)

Enum — MEDIUM priority

• Python enum.Enum objects may not get converted to strings → D1_TYPE_ERROR
• Fix: D1Enum processor extracting the enum value as a string

Interval — MEDIUM priority

• Python timedelta objects get converted to datetime internally but still arrive as objects → D1_TYPE_ERROR
• Fix: D1Interval processor converting to/from a numeric or string representation
• Less commonly used than the others

Types that are already safe (no action needed)

• Numeric / Float — converted to primitive float by default
• JSON — json.dumps() produces a string
• PickleType — pickles to bytes, handled by D1LargeBinary

References

• Pattern: D1Boolean, D1Date, D1DateTime, D1LargeBinary in dialect.py
• Issue Support sqlalchemy.Date #15 / PR Add Date type support (Issue #15) #17 — most recent type processor addition (D1Date)