[MAYA-127755] Can't import a .usdc file into Maya

**Describe the bug**
Importing a `.usdc` file in Maya does not work. No objects are created in the scene. However, renaming the same file to `.usd` and importing it does work.

**Steps to reproduce**
1. Create a cube, export the cube to a binary USD file and name it `cube.usdc` (or use the attached cube.usdc)
2. Go to File -> Import and try to import the `cube.usdc` file
3. The scene stays empty
4. Rename `cube.usdc` file to `cube.usd`
5. Go to File -> Import and try to import the `cube.usd` file
6. Importing the `cube.usd` does work, the cube is created

**Expected behavior**
It should be possible to import a `.usdc` file the same way as a `.usd` or `.usda` file.

**Attachments**
I attached an example `.usdc` file. The behavior is not specific to this file, any other `.usdc` file does not work, too.
[cube.zip](https://github.com/Autodesk/maya-usd/files/10690031/cube.zip)

**Specs (if applicable):**
- OS & version: Windows 10
- Maya USD version 0.21.0 for Maya 2023.3, installed using the official Installer from Github Releases