Bugfix: Add OCIO as submodule to prepare for handling maketx color space conversion.

[ghost]

Brief description

maketx executable requires an OCIO config file path appended when using the --colorconfig flag. This resolves #3584 and prepares for preventing maketx from crashing when publishing OpenPype Look instances.

Description

Adding OCIO as a submodule and adding functionality to grab the OCIO config file path based on a profile folder parameter as the function argument.

Testing:

1. Create some geo and OP model instance.
2. Publish it.
3. load model instance in.
4. Create shader, apply a test base color texture (that's in sRGB).
5. publish it.

The publishing should produce a .tx file that's optimized for MtoA. (Make sure create .tx is enabled in the look creator)

[ynbot]

Task linked: OP-3657 maketx built with OCIO support requires config

[m-u-r-p-h-y]

tested per instructions

publishing went smoothly, with tx file generated

// pyblish.ExtractLook : tx: converting sRGB -> linear // 
// pyblish.ExtractLook : Generating .tx file for D:\PROJECTS\murphy_22101\assets\props\testProp2\work\lookdev\macbeth_srgb.tif .. // 
// pyblish.ExtractLook : file will be copied C:\Users\murph\AppData\Local\Temp\pyblish_tmp_ozlxpjrw\resources\macbeth_srgb.tx -> D:\PROJECTS\murphy_22101\assets\props\testProp2\publish\look\lookMain\v001\resources\macbeth_srgb.tx // 
// 

[BigRoy]

Just want to mention here that this PR adds a 2.3 GB file size to OpenPype builds and installs as I mentioned on discord. The code currently only uses the 2.3 MB nuke-default folder so it might be the easiest quick fix for now to only include that somehow.

[antirotor]

we've decided to have our own forked and curated set that should be used instead, not just for that particular issue but also for proper support of color management.