Provide plugins like `usdAbc` and `usdMtlx` via `pip`

[nvmkuruc]

Description

Some plugins to OpenUSD aren't available via usd-core. usdAbc provides the alembic file format and usdMtlx provides the MaterialX shader registry. Both are commonly used throughout the OpenUSD ecosystem. Not supporting this usd-core limits the surface area of assets that can be operated on.

Some possible designs:

• Always provided in the usd-core package (pip install usd-core)
• Always provided in an uber package (pip install usd-full)
• Provided as a separate distribution (pip install usd-abc, pip install usd-mtlx)
• Provided as extras for usd-core (pip install usd-core[mtlx])

Champion

• Matt Kuruc (NVIDIA) - @nvmkuruc

Implementation Leads

• Full Name (Company) - @githubhandle

Pull Requests and Issues

Other information

[pmolodo]

Need to decide on a plan of action, and vote/approve