MINOR: global: add experimental shm-stats-file-max-objects option #1033

Job	Run time
generate-models	1m 33s
generate-specification	1m 0s
HAProxy check commit message	0s
lint-spec	0s
Tests	0s
go mod tidy	0s
Build	0s
Test equal	-1s
golangci-lint	-1s
license-check	-1s
e2e on HAProxy	-1s
	2m 29s

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