kvlist: add _s APIs to pass str length as arg (#36) #152

Job	Run time
CentOS 7 build to confirm no issues once used downstream	1m 5s
Build with various code analysis tools (clang-sanitize-address)	20s
Build with various code analysis tools (clang-sanitize-memory)	20s
Build with various code analysis tools (clang-sanitize-undefined)	17s
Debian Buster build to confirm no issues once used downstream	24s
Build sources on MSYS2 for windows-latest	1m 25s
Build sources on amd64 for ubuntu-latest - gcc	6s
Build sources on arm64 for ubuntu-latest - gcc	1m 38s
Build sources on MSYS2 for windows-2019	1m 12s
Build sources on amd64 for ubuntu-latest - clang	6s
Build sources on arm64 for ubuntu-latest - clang	1m 30s
Build with various code analysis tools (clang-sanitize-dataflow)	17s
Build sources on amd64 for macos-latest - gcc	14s
Build with various code analysis tools (clang-sanitize-safe-stack)	17s
Build sources on amd64 for macos-latest - clang	11s
Build sources on amd64 for windows-latest	15s
Build with various code analysis tools (valgrind)	20s
Build sources on amd64 for windows-2019	30s
	10m 27s

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