utils: compat: Borrow string splitting function as cfl_utils_split from fluent-bit #170

Job	Run time
CentOS 7 build to confirm no issues once used downstream	46s
Build with various code analysis tools (clang-sanitize-address)	20s
Build with various code analysis tools (clang-sanitize-memory)	22s
Debian Buster build to confirm no issues once used downstream	30s
Build with various code analysis tools (clang-sanitize-undefined)	19s
Build sources on MSYS2 for windows-latest	1m 20s
Build sources on amd64 for ubuntu-latest - gcc	8s
Build with various code analysis tools (clang-sanitize-dataflow)	20s
Build sources on MSYS2 for windows-2019	1m 28s
Build sources on amd64 for ubuntu-latest - clang	11s
Build sources on arm64 for ubuntu-latest - gcc	5m 54s
Build with various code analysis tools (clang-sanitize-safe-stack)	18s
Build sources on amd64 for macos-latest - gcc	12s
Build with various code analysis tools (valgrind)	18s
Build sources on arm64 for ubuntu-latest - clang	3m 51s
Build sources on amd64 for windows-latest	11s
Build sources on amd64 for macos-latest - clang	10s
Build sources on amd64 for windows-2019	1m 5s
	17m 43s

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