feat: PeerMixin, BaseContext, Connection, server Context #1925

Job	Run time
checks / pre-commit	31s
checks / readme-snippets	15s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, windows-latest)	3m 46s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.11, lowest-direct, windows-latest)	3m 4s
checks / test (3.12, locked, windows-latest)	3m 11s
checks / test (3.11, locked, windows-latest)	2m 53s
checks / test (3.10, locked, windows-latest)	2m 42s
checks / test (3.13, locked, windows-latest)	2m 11s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.11, lowest-direct, ubuntu-latest)	59s
checks / test (3.13, lowest-direct, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.10, lowest-direct, windows-latest)	2m 36s
checks / test (3.14, locked, ubuntu-latest)	2m 17s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.14, locked, windows-latest)	3m 2s
checks / test (3.14, lowest-direct, windows-latest)	3m 59s
checks / test (3.13, lowest-direct, windows-latest)	3m 21s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
all-green	5s
	42m 40s

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