Update QuatDescriptor for typed-descriptor-lazy-default

[taldcroft]

Description

This makes a few changes for compatibility with https://github.com/sot/ska_helpers/pull/54.

Interface impacts

None

Testing

Unit tests

• [x] Mac

  
  (masters) ➜  cxotime git:(cxotime-descr) git rev-parse HEAD                                                             
  f0f3d24d17f318c54b483e644ead80142b7439e1
  (masters) ➜  cxotime git:(cxotime-descr) pytest
  ===================================================== test session starts ======================================================
  platform darwin -- Python 3.10.8, pytest-7.2.1, pluggy-1.0.0
  rootdir: /Users/aldcroft/git, configfile: pytest.ini
  plugins: timeout-2.1.0, anyio-3.6.2
  collected 235 items                                                                                                            

cxotime/tests/test_cxotime.py .......................................................................................... [ 38%] ........................................................................................................................ [ 89%] ......................... [100%]

===================================================== 235 passed in 2.15s ======================================================

Independent check of unit tests by [REVIEWER NAME]
- [ ] [PLATFORM]:

### Functional tests
<!-- Describe and document results of any functional tests, otherwise leave the text below -->
No functional testing.