feat(auth): add unified auth protocol discovery and optional DPoP support #567

Job	Run time
checks / pre-commit	39s
checks / readme-snippets	11s
checks / test (3.10, lowest-direct, windows-latest)	2m 38s
checks / test (3.10, locked, windows-latest)	3m 11s
checks / test (3.10, locked, ubuntu-latest)	54s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.11, lowest-direct, windows-latest)	2m 55s
checks / test (3.12, lowest-direct, windows-latest)	3m 47s
checks / test (3.12, locked, windows-latest)	3m 31s
checks / test (3.11, locked, ubuntu-latest)	51s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.11, locked, windows-latest)	2m 37s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.13, locked, windows-latest)	2m 36s
checks / test (3.14, locked, ubuntu-latest)	2m 22s
checks / test (3.14, locked, windows-latest)	3m 33s
checks / test (3.13, lowest-direct, ubuntu-latest)	56s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, windows-latest)	3m 40s
checks / test (3.14, lowest-direct, windows-latest)	2m 32s
all-green	5s
	42m 48s

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