[v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed (#2… #2701

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	15s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.11, locked, ubuntu-latest)	56s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.11, lowest-direct, windows-latest)	1m 31s
checks / test (3.14, lowest-direct, windows-latest)	1m 35s
checks / test (3.12, locked, windows-latest)	1m 14s
checks / test (3.11, locked, windows-latest)	1m 32s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.13, locked, windows-latest)	2m 25s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.10, lowest-direct, windows-latest)	1m 20s
checks / test (3.13, lowest-direct, windows-latest)	1m 28s
checks / test (3.12, lowest-direct, windows-latest)	1m 55s
checks / test (3.10, locked, windows-latest)	1m 25s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.13, locked, ubuntu-latest)	52s
checks / test (3.14, locked, windows-latest)	2m 18s
checks / test (3.14, locked, ubuntu-latest)	1m 59s
all-green	2s
	29m 14s

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