feat: record stacktrace with goroutine id for objects allocated in stack

[Lslightly]

What type of PR is this?

feat

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• The description of this PR title is user-oriented and clear enough for others to understand.
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en: For local variables in stack, the stacktrace is recorded as pprofIndex and the goroutine id is also recorded at the bottom of the stacktrace, i.e. the top of the pprof flamegraph in the form of G<id>.
zh(optional):

Take test/testdata/manygo/main.go as an example. The flamegraph is as follows. There are 3 groups of goroutines whose members share same stacktrace.

Hope that it supplements goroutine leak profile.

(Optional) Which issue(s) this PR fixes:

Fixes #65

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