op - add CeedOperatorLinearAssembleQFunctionBuildOrUpdate to reduce kernel calls in diagonal/full/fdm assembly

Merge pull request #806 from CEED/jeremy/get-fields

Promote Field Getters to Public API

doc - update release notes

Co-authored-by: Jed Brown <jed@jedbrown.org>

doc - add single precision release note

qf/op - make immutability conditions explicit

interface - promote field getters to public API

interface - refactor *GetFields to include number of fields

Merge pull request #703 from CEED/jed/doc-myst-nb

doc: replace recommonmark with MyST

doc: replace ReST tables/list-table with MyST

doc: replace recommonmark with MyST and migrate ReST to MyST

This offers more familiar syntax for most writing, as well as natural
$\pi$ math (versus :math:`\pi`) and markdown syntax for all ReST
fe

doc: replace recommonmark with MyST and migrate ReST to MyST

This offers more familiar syntax for most writing, as well as natural
$\pi$ math (versus :math:`\pi`) and markdown syntax for all ReST
features.

The API doc stubs remain in ReST as recommended for autodoc.

https://myst-parser.readthedocs.io/en/latest/sphinx/use.html#use-sphinx-ext-autodoc-in-markdown-files

The change was largely implemented using
https://github.com/executablebooks/rst-to-myst/ with some manual
fix-ups. Tables (both ReST built-in tables and list-table) remain under
eval-rst until they can be manually updated.

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