feat: add public setter methods for ClientSession callbacks #1802

Job	Run time
checks / readme-snippets	16s
checks / pre-commit	35s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, windows-latest)	2m 57s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.10, locked, windows-latest)	2m 21s
checks / test (3.11, locked, windows-latest)	2m 24s
checks / test (3.12, locked, windows-latest)	3m 16s
checks / test (3.12, locked, ubuntu-latest)	1m 0s
checks / test (3.10, lowest-direct, windows-latest)	2m 36s
checks / test (3.12, lowest-direct, windows-latest)	3m 32s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.13, locked, windows-latest)	2m 36s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.13, lowest-direct, ubuntu-latest)	57s
checks / test (3.14, lowest-direct, windows-latest)	2m 14s
checks / test (3.13, lowest-direct, windows-latest)	2m 40s
checks / test (3.14, locked, windows-latest)	3m 9s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
all-green	2s
	39m 39s

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