Aleksey Shakhmatov 6b1941fce7 Add foundation: middleware type, error types, and internal clock ...

Introduce the core building blocks for the httpx library:
- middleware.Middleware type and Chain() composer
- Error struct with sentinel errors (ErrRetryExhausted, ErrCircuitOpen, ErrNoHealthy)
- internal/clock package with Clock interface and MockClock for deterministic testing

2026-03-20 14:21:43 +03:00

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