feat: gno mod graph

[moul]

Basic initial version compatible with go mod graph in terms of output, while allowing the specification of folders through an optional argument.

• implement
• tests
• share examples

Depends on #3587

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 83.78378% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/cmd/gno/mod.go	83.78%	4 Missing and 2 partials ⚠️

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[moul]

gno mod graph ./examples | go run golang.org/x/exp/cmd/modgraphviz@latest | dot -Tsvg -o graph.svg

---

gno mod graph ./examples | grep -v /r/ | go run golang.org/x/exp/cmd/modgraphviz@latest | dot -Tsvg -o graph2.svg

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gno mod graph ./examples | grep -v /p/ | go run golang.org/x/exp/cmd/modgraphviz@latest | dot -Tsvg -o graph3.svg

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gno mod graph ./examples | grep /moul/ | go run golang.org/x/exp/cmd/modgraphviz@latest | dot -Tsvg -o graph4.svg

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gno mod graph ./examples | grep /sys/ | go run golang.org/x/exp/cmd/modgraphviz@latest | dot -Tsvg -o graph5.svg

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gno mod graph ./examples | grep /gov/ | go run golang.org/x/exp/cmd/modgraphviz@latest | dot -Tsvg -o graph6.svg

[zivkovicmilos]

Looks good 👌

I think a master pull into this branch will resolve the CI issues-- but I can't seem to do it on my own