Add some mpoly context util functions #981

Job	Run time
Test coverage setuptools build	5m 7s
Build sdist	3m 43s
Build wheels for ubuntu-20.04	14m 16s
Test docs (build and doctest)	4m 54s
Build wheels for windows-2019	30m 30s
Test flint main	4m 46s
Test flint v3.0.0	4m 57s
Build wheels for macos-13	17m 37s
Test flint v3.0.1	4m 59s
Free-threaded 3.13-dev on ubuntu-24.04	5m 8s
Build wheels for macos-14	10m 9s
Test old Cython/meson-python	2m 4s
Test flint v3.1.0	4m 39s
Test flint v3.1.1	4m 34s
Build on ubuntu-24.04	2m 0s
Test SymPy 1.13.1	18m 13s
Test flint v3.1.2	4m 57s
Publish to PyPI	0s
Test 3.10 wheel on ubuntu-20.04	15s
Test 3.11 wheel on ubuntu-20.04	6s
Test 3.12 wheel on ubuntu-20.04	11s
Test 3.13-dev wheel on ubuntu-20.04	14s
Test pypy3.10 wheel on ubuntu-20.04	20s
Test 3.10 wheel on windows-2019	32s
Test 3.11 wheel on windows-2019	17s
Test 3.12 wheel on windows-2019	18s
Test 3.13-dev wheel on windows-2019	1m 25s
Test pypy3.10 wheel on windows-2019	22s
Test 3.10 wheel on macos-13	12s
Test 3.11 wheel on macos-13	12s
Test 3.12 wheel on macos-13	11s
Test 3.13-dev wheel on macos-13	58s
Test pypy3.10 wheel on macos-13	22s
Test 3.10 wheel on macos-14	8s
Test 3.11 wheel on macos-14	8s
Test 3.12 wheel on macos-14	10s
Test 3.13-dev wheel on macos-14	27s
Test pypy3.10 wheel on macos-14	21s
Publish GitHub release	0s
	2h 29m 42s

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