[v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed #2695

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	11s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.11, lowest-direct, windows-latest)	1m 19s
checks / test (3.13, locked, windows-latest)	1m 35s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.11, locked, windows-latest)	2m 1s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.10, locked, windows-latest)	1m 26s
checks / test (3.10, lowest-direct, windows-latest)	1m 19s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.14, lowest-direct, windows-latest)	1m 30s
checks / test (3.14, lowest-direct, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, ubuntu-latest)	52s
checks / test (3.13, lowest-direct, windows-latest)	2m 10s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.14, locked, windows-latest)	2m 14s
checks / test (3.12, lowest-direct, windows-latest)	2m 4s
checks / test (3.14, locked, ubuntu-latest)	1m 48s
checks / test (3.12, locked, windows-latest)	1m 8s
all-green	3s
	27m 10s

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