[v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed #2697

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, windows-latest)	1m 20s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.14, lowest-direct, ubuntu-latest)	51s
checks / test (3.11, locked, ubuntu-latest)	45s
checks / test (3.13, locked, windows-latest)	1m 16s
checks / test (3.10, locked, windows-latest)	1m 28s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.14, locked, windows-latest)	2m 12s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.10, lowest-direct, windows-latest)	1m 20s
checks / test (3.11, locked, windows-latest)	1m 22s
checks / test (3.13, lowest-direct, windows-latest)	1m 26s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, windows-latest)	1m 11s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.12, lowest-direct, windows-latest)	1m 24s
checks / test (3.12, locked, windows-latest)	1m 29s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.14, locked, ubuntu-latest)	1m 51s
all-green	3s
	24m 46s

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