feat(#4130): generating CPU flamegraphs

[moonia]

This PR introduces an initial implementation of the flamegraph subcommand in the gnodev tool. It enables basic CPU profiling of Go binaries and generates flamegraphs for performance analysis (for the moment).

Usage:

gnodev flamegraph --bin ./binary --duration 30 --output flamegraph.svg

• --bin: path to the compiled Go binary to profile

• --duration: profiling duration in seconds

• --output: destination path for the generated flamegraph (SVG format)

---

⚠️ Work in progress

The primary goal is to enable CPU profiling specifically on gno programs in the future.

Related issue https://github.com/gnolang/gno/issues/4151

[Gno2D2]

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[notJoon]

Could you please update the branch and resolve the CI errors? Thank you