VS: Add v143 flag tables for VS 17.0 Preview 2

Run the commands

    python3 Source/cmConvertMSBuildXMLToJSON.py -t v143 \
        'c:/.../2022/Preview/MSBuild/Microsoft/VC/v170/1033/cl.xml'
    python3 Source/cmConvertMSBuildXMLToJSON.py -t v143 \
        'c:/.../2022/Preview/MSBuild/Microsoft/VC/v170/1033/link.xml'

To generate `Templates/MSBuild/FlagTables/v143_{CL,Link}.json`.
We can re-use `Templates/MSBuild/FlagTables/v14_LIB.json`.