Miscellaneous camera controls, IMX582/IMX586 on-sensor HDR

[alex-luxonis]

Related: https://github.com/luxonis/depthai-core/pull/972 (see for a detailed description)

utilities/cam_test.py: new option

  -misc MISC_CONTROLS [MISC_CONTROLS ...], --misc-controls MISC_CONTROLS [MISC_CONTROLS ...]
                       List of miscellaneous camera controls to set initially, as pairs:
                       key1=value1 key2=value2 ...

For example to enable HDR on IMX582 (OAK-1-MAX):

python3 utilities/cam_test.py -cams rgb,c -rs -cres 12mp -fps 10 -misc hdr-exposure-ratio=4

• R key to select HDR exposure ratio, then adjust with -_ and +=
• G key to select HDR local tone weight, then adjust with -_ and +=
• H key to toggle HCG (high conversion gain) mode on/off on IMX462 or IMX678

(when testing HDR, it's also suggested for now to set manual exposure, I O K L)