add and use request->local_dict #10468

Job	Run time
pre-ci	7s
master-self-ubuntu24-linux-gcc-O2-g3	9m 2s
master-self-ubuntu24-linux-clang-O2-g3	11m 38s
master-self-ubuntu24-linux-gcc-ndebug	9m 4s
master-self-ubuntu24-linux-gcc	9m 29s
master-self-ubuntu24-linux-clang	11m 52s
master-self-ubuntu24-linux-clang-lean	10m 3s
master-self-ubuntu24-linux-fuzzer	8m 21s
master-self-ubuntu24-linux-gcc-lean	8m 26s
master-self-ubuntu24-linux-clang-ndebug	10m 56s
master-self-ubuntu24-linux-clang-altlibs	11m 2s
Merge into upstream	0s
	1h 40m 0s

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