utils: compat: Borrow string splitting function as cfl_utils_split from fluent-bit #175

Job	Run time
CentOS 7 build to confirm no issues once used downstream	59s
Build with various code analysis tools (clang-sanitize-address)	22s
Build with various code analysis tools (clang-sanitize-memory)	21s
Debian Buster build to confirm no issues once used downstream	34s
Build with various code analysis tools (clang-sanitize-undefined)	18s
Build sources on MSYS2 for windows-latest	1m 17s
Build sources on amd64 for ubuntu-latest - gcc	7s
Build with various code analysis tools (clang-sanitize-dataflow)	22s
Build sources on MSYS2 for windows-2019	1m 32s
Build sources on amd64 for ubuntu-latest - clang	20s
Build with various code analysis tools (clang-sanitize-safe-stack)	18s
Build sources on arm64 for ubuntu-latest - gcc	4m 16s
Build sources on amd64 for macos-latest - gcc	15s
Build with various code analysis tools (valgrind)	21s
Build sources on arm64 for ubuntu-latest - clang	4m 11s
Build sources on amd64 for windows-latest	13s
Build sources on amd64 for macos-latest - clang	14s
Build sources on amd64 for windows-2019	1m 10s
	17m 10s

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