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Form factor check support

Jarvis Huang requested to merge quic_jarvhuan/monado:xrt-device-is-form-factor-available into main

This MR intends to support XR_ERROR_FORM_FACTOR_UNAVAILABLE while calling xrGetSystem. According to the specification:

If the form factor is supported but temporarily unavailable, xrGetSystem must return XR_ERROR_FORM_FACTOR_UNAVAILABLE. A runtime may return XR_SUCCESS on a subsequent call for a form factor it previously returned XR_ERROR_FORM_FACTOR_UNAVAILABLE. For example, connecting or warming up hardware might cause an unavailable form factor to become available.

Adding xrt_device::form_factor_check_supported and xrt_device::is_form_factor_available. If HMD driver supports the check, xrGetSystem can determine either request form factor is available or not from xrt_device.

Tested with android_sensor driver offline with Pixel 4.

Edited by Jarvis Huang

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