added support of icm45686 sensor

[Yuri-Sharapov]

This PR adds support for the InvenSense ICM45686 accelerometer and gyroscope.

Changes include:

• New driver files: accgyro_icm45686.c and accgyro_icm45686.h
• Added detection and initialization in accel and gyro modules
• Updated enum definitions for the new IMU in cli

Features:

• SPI interface
• Accelerometer
• Gyroscope
• Compatible with F4-based flight controllers

Tested:

• Built successfully
• Basic sensor reading verified on CSKYAVEGA F405 Wing board

Notes:

• This PR only adds the IMU driver; board target integration will be in a separate PR.

[github-actions]

Branch Targeting Suggestion

You've targeted the master branch with this PR. Please consider if a version branch might be more appropriate:

• maintenance-9.x - If your change is backward-compatible and won't create compatibility issues between INAV firmware and Configurator 9.x versions. This will allow your PR to be included in the next 9.x release.

• maintenance-10.x - If your change introduces compatibility requirements between firmware and configurator that would break 9.x compatibility. This is for PRs which will be included in INAV 10.x

If master is the correct target for this change, no action is needed.

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[github-actions]

Test firmware build ready — commit 96a0ec3

Download firmware for PR #11418

225 targets built. Find your board's .hex file by name on that page (e.g. MATEKF405SE.hex). Files are individually downloadable — no GitHub login required.

Development build for testing only. Use Full Chip Erase when flashing.