feat: PeerMixin, BaseContext, Connection, server Context #1888

Job	Run time
checks / pre-commit	40s
checks / readme-snippets	13s
checks / test (3.11, lowest-direct, ubuntu-latest)	49s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.12, locked, windows-latest)	3m 23s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.10, locked, windows-latest)	2m 45s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.14, lowest-direct, windows-latest)	2m 54s
checks / test (3.11, locked, windows-latest)	3m 6s
checks / test (3.10, lowest-direct, windows-latest)	2m 55s
checks / test (3.14, locked, windows-latest)	3m 5s
checks / test (3.10, locked, ubuntu-latest)	46s
checks / test (3.14, locked, ubuntu-latest)	2m 19s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.13, locked, windows-latest)	2m 11s
checks / test (3.12, lowest-direct, windows-latest)	4m 33s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, windows-latest)	3m 13s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.13, lowest-direct, windows-latest)	3m 6s
all-green	6s
	42m 26s

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