[v2] ClientSession runs on JSONRPCDispatcher; BaseSession removed #2622

Job	Run time
checks / readme-snippets	12s
checks / pre-commit	28s
checks / test (3.10, lowest-direct, windows-latest)	1m 33s
checks / test (3.11, lowest-direct, windows-latest)	1m 36s
checks / test (3.10, locked, windows-latest)	1m 9s
checks / test (3.13, lowest-direct, windows-latest)	1m 37s
checks / test (3.12, lowest-direct, windows-latest)	2m 17s
checks / test (3.13, locked, windows-latest)	1m 21s
checks / test (3.12, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, ubuntu-latest)	41s
checks / test (3.11, locked, windows-latest)	1m 15s
checks / test (3.14, locked, ubuntu-latest)	1m 56s
checks / test (3.12, locked, windows-latest)	1m 28s
checks / test (3.14, lowest-direct, windows-latest)	1m 59s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.14, locked, windows-latest)	2m 4s
checks / test (3.13, lowest-direct, ubuntu-latest)	51s
checks / test (3.14, lowest-direct, ubuntu-latest)	53s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, ubuntu-latest)	58s
all-green	3s
	26m 37s

Provide feedback