json: Use JSON maps instead of string hashes for objects. #3277

Job	Run time
build oss-fuzz fuzzers	2m 58s
dpdk gcc (ubuntu-24.04)	5s
linux deb no dpdk	6m 47s
libreswan (ubuntu-24.04)	5s
linux rpm fedora	4m 13s
osx clang --disable-ssl	1m 30s
clang-analyze-cache	21s
linux gcc --disable-ssl	4m 7s
linux clang --disable-ssl	2m 45s
linux gcc c99	2m 39s
linux clang c99	2m 32s
linux gcc test	8m 36s
linux clang address,undefined test	16m 36s
linux gcc test --enable-shared	11m 41s
linux clang test --enable-shared	12m 25s
linux gcc check check-dpdk dpdk	19m 16s
linux clang check check-dpdk dpdk	18m 45s
linux gcc test -ljemalloc	8m 55s
linux clang test -ljemalloc	10m 23s
linux gcc --enable-afxdp	2m 46s
linux clang --enable-afxdp	2m 34s
linux gcc dpdk --enable-shared	4m 22s
linux clang dpdk --enable-shared	4m 9s
linux gcc dpdk-shared	3m 13s
linux clang dpdk-shared	3m 11s
linux gcc dpdk-shared --enable-shared	4m 8s
linux clang dpdk-shared --enable-shared	4m 41s
linux gcc m32 --disable-ssl	2m 29s
linux gcc check-ovsdb-cluster	7m 8s
linux gcc check-kernel -100	10m 45s
linux gcc check-kernel 100-	17m 40s
linux clang address,undefined check-kernel -100	13m 3s
linux clang address,undefined check-kernel 100-	20m 49s
linux gcc check-offloads -100	10m 0s
linux gcc check-offloads 100-	12m 38s
linux gcc dpdk check-system-userspace	12m 42s
linux clang address,undefined dpdk check-system-userspace	16m 29s
linux gcc dpdk check-system-tso	12m 21s
linux gcc dpdk check-afxdp	11m 57s
clang-analyze	10m 43s
	5h 22m 27s

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