conf, router: Make the listen(2) backlog configurable #645

Job	Run time
test (unit, ubuntu-latest)	1m 8s
test (go-1.21, ubuntu-latest)	1m 27s
test (go-1.22, ubuntu-latest)	1m 41s
test (java-17, ubuntu-latest)	2m 31s
test (java-18, ubuntu-latest)	2m 39s
test (java-21, ubuntu-latest)	2m 44s
test (node-20, ubuntu-latest)	1m 12s
test (node-21, ubuntu-latest)	59s
test (perl, ubuntu-latest)	45s
test (php-8.1, ubuntu-latest)	1m 4s
test (php-8.2, ubuntu-latest)	43s
test (php-8.3, ubuntu-latest)	39s
test (python-3.11, ubuntu-latest)	5m 24s
test (python-3.12, ubuntu-latest)	5m 33s
test (ruby-3.2, ubuntu-latest)	1m 1s
test (ruby-3.3, ubuntu-latest)	46s
test (wasm, ubuntu-latest)	2m 47s
test (wasm-wasi-component, ubuntu-latest)	3m 8s
	36m 11s

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