Add hood conversion helpers for pulse-width to motor-rotation migration

[LTeixeira4909]

Motivation

• Provide a small, reusable conversion helper to migrate legacy hood setpoints (1000–2000 µs used for a 50 mm actuator) to equivalent motor rotations for a rack-and-pinion motor-driven hood so existing shot positions remain the same.

Description

• Add frc.robot.subsystems.hood.HoodConversions with constants for the legacy pulse range and stroke and with three helpers: pulseWidthToTravelMillimeters, travelMillimetersToMotorRotations, and pulseWidthToMotorRotations (uses pinion pitch diameter and motor:pinion ratio).

Testing

• Ran ./gradlew test -q in this environment but the build failed during Gradle script analysis with Unsupported class file major version 69 (Java/Gradle toolchain mismatch), so no automated tests were executed.

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Codex Task