feat(client): Add capability_extensions parameter to ClientSession #176

Job	Run time
checks / pre-commit	16s
checks / readme-snippets	10s
checks / test (3.10, locked, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, locked, windows-latest)	3m 20s
checks / test (3.11, lowest-direct, windows-latest)	2m 36s
checks / test (3.10, locked, windows-latest)	2m 17s
checks / test (3.12, lowest-direct, windows-latest)	3m 53s
checks / test (3.13, lowest-direct, windows-latest)	2m 17s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 11s
checks / test (3.13, locked, windows-latest)	2m 28s
checks / test (3.14, locked, ubuntu-latest)	2m 16s
checks / test (3.11, locked, windows-latest)	3m 9s
checks / test (3.14, locked, windows-latest)	3m 1s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.10, lowest-direct, ubuntu-latest)	48s
checks / test (3.10, lowest-direct, windows-latest)	2m 18s
checks / test (3.14, lowest-direct, windows-latest)	2m 20s
checks / test (3.11, locked, ubuntu-latest)	46s
all-green	3s
	37m 56s

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