refactor(managers): O(1) tenant lookups and missing APIs #30

Job	Run time
checks / pre-commit	41s
checks / readme-snippets	15s
checks / test (3.10, locked, windows-latest)	2m 25s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, windows-latest)	2m 47s
checks / test (3.10, locked, ubuntu-latest)	50s
checks / test (3.10, lowest-direct, ubuntu-latest)	50s
checks / test (3.10, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, lowest-direct, windows-latest)	3m 45s
checks / test (3.13, lowest-direct, ubuntu-latest)	47s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.14, locked, windows-latest)	3m 33s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.12, lowest-direct, ubuntu-latest)	53s
checks / test (3.14, lowest-direct, windows-latest)	2m 44s
checks / test (3.12, locked, windows-latest)	3m 25s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.13, locked, windows-latest)	2m 21s
checks / test (3.13, lowest-direct, windows-latest)	2m 51s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 15s
checks / test (3.14, locked, ubuntu-latest)	2m 26s
checks / test (3.11, locked, windows-latest)	2m 34s
all-green	3s
	40m 10s

Provide feedback