LazilyUnpickling{Dict,List}: add repr (#817) #186

Job	Run time
Documentation	1m 40s
Tests for downstream project Firedrake	18m 36s
Tests for downstream project arraycontext	2m 40s
Tests for downstream project meshmode	10m 8s
Conda Examples	1m 47s
Tests for downstream project grudge	10m 28s
Mypy	1m 22s
Pylint	1m 35s
Tests for downstream project pytential	54m 10s
Conda Pytest (ubuntu-latest)	4m 3s
Tests for downstream project pytato	6m 14s
Conda Pytest (macos-latest)	3m 51s
Conda Pytest with Intel CL	3m 55s
Conda Pytest without arg check	3m 51s
Conda Pytest Twice (for cache behavior)	5m 16s
Ruff	5s
Typos	6s
Validate CITATION.cff	17s
	2h 10m 4s

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