[clang][analyzer] Add SyntaxRunningTime per-entry-point metric (#163341)

Per-entry-point metrics are captured during the path-sensitive analysis
time. For that reason, it is not trivial to add the syntax-only analysis
time as it runs in a separate stage. Luckily syntax-only analysis is
done before path-senstivie analysis.

I use the function summary field to keep the syntax-only anlaysis time
once syntax analysis is done, and then forward it to the per-EP metrics
snapshot during the path-sensitive analysis.

Note that some of the entry points that were analyzed by syntax-only
rules may be missing in the CSV export if they were never analyzed by
path-sensitive rules. Conversely, if a function is analyzed with
path-sensitive analysis but not syntax-only analysis, its
`SyntaxRunningTime` will be empty.

--

CPP-7099

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